Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f88dc1c71d6d41c…

MALICIOUS

PDF

80.7 KB Created: 2021-08-15 05:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e98ce26a7b3da3bcf1a0d90597270dd9 SHA-1: 84da11174fb9b289684a1fd3e94fb64031418aee SHA-256: 1f88dc1c71d6d41c4eab750e68c20aa0ca72b9e7d9422be8899722fb9e4c553a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external PDFs hosted on compromised websites, suggesting a link farm designed to distribute malware. The presence of a raw IP address in one of the URIs further increases suspicion. No scripts were extracted, but the overall structure and URL distribution point to a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b584cf678---13446246786.pdf In PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d059e0bb1---besuzurivexati.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/vaxiduluvuxivegalupezowo.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/86961730395.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/57087441832.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa284fa32---45166382036.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/65273217093.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5462ed419e---97459461194.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca208e4430---48360491157.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/ba36f522645c2fd4c29f29ad875864b9/89194701402.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/79638664017.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/22005345732.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/2583487238.pdfIn PDF document text
    • http://orlickachata.cz/files/files/nefaba.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f9b1272e5---bakiralisu.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/pitagalaxikorewajeketubeb.pdfPDF link annotation
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/pab87qkpnba7poif2sr5erem55/17585247630.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b81196af08b---69772215271.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d817b829d---mebomuredaguxegalezolo.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/b09f11622fa28965d0082766d29516ea/nudajemavakunulitijemez.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/nemiribigotarupe.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/40810091042.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a0063faea---xaxifijovesikorulujawu.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/nobokaf.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/2de1e7df84e326740a63f68d7fa5d146/torifixipizabe.pdfIn PDF document text
    • https://activepymes.com/pub/file/naveruxulawogaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=bpsc.teletalk.com.bd+admit+card+download+43rd+bcsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 17036 bytes
SHA-256: 2f21ebe46f4e846ef12383f9f6f0a56062abcacaf4c953311b04bd12962125e8
font_02_sfnt_off00011a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A14 11364 bytes
SHA-256: 7d270c2016bf0e8d0d9a78bce5b2294d509ca14b6b70c2c6cefd2dd88e8c9d25

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