Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc48087063d3ab9f…

MALICIOUS

PDF

74.0 KB Created: 2021-09-04 21:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 747a364b6bf6e9ed7d264c6da95d5cef SHA-1: a8449030accac23675a9a4d3e188e047d1741646 SHA-256: bc48087063d3ab9f1eac9a30ebc0bb7b891908796c0b51a9b046d3a863ca3e5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of external URIs and link farms suggests an attempt to redirect users, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/bde5b8191794b7f2f6d3a8cd8cc1cede/pilebujadafa.pdf In PDF document text
    • https://lordoptika.hu/files/files/54774171958.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/708e6fd281ff1af9b89e9cbd205c9014/43164705670.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/aeec98c01273d5c261f8880112890144/liwobapujedexudemitunoza.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072348e41479---tixinonuxakurumusujegamo.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/popopekozebo.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/fajuzeburifufuxolomoxoj.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/vixafovixoxoranulonetes.pdfIn PDF document text
    • https://hirurgija.me//files/wafuguju.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/laropanenakivufat.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/10138753135.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/zofodun.pdfIn PDF document text
    • https://magnificenttreks.com/userfiles/file/32403240933.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/wogujepabixelelutalitu.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aef53e5475b---vawanus.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fadd2df0e4c---muxeselisamagowu.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/34206926423.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/23469459964.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16123722e35f94---janujogilanoluxaxivofu.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/45014470348.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/103de077642242db0e674f3a2f7fdd3a/89567153116.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202107160652578520.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21bcaa7061---4634598646.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160821dae96813---48347046093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=escuela+neoplatonica+pdfPDF 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_off0000bd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD96 17528 bytes
SHA-256: 0f958f4b509d72fcc6950d9ed934a7b9ca35ab99843a73940f43dc50bc7b4095
font_01_sfnt_off0000ea19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 10596 bytes
SHA-256: 07330bf40c842a9f0ec800379b68cd0723dce1f71270548e7e9f4ddd82db85ef
font_02_sfnt_off0001026d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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