Malicious PDF — malware analysis report

Static analysis result for SHA-256 7524eb362890f1ef…

MALICIOUS

PDF

88.4 KB Created: 2021-08-17 00:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d49376a7e7b419ea66ae110c87336b62 SHA-1: aa878373ecfdfc1fc1bfa68e59f68b074b2b12c9 SHA-256: 7524eb362890f1efa7f8510c1b8e50111e36acc57ac5c46330837d22c036bb3a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and other domains, likely serving as a link farm to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or trojan delivery. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to lure users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pixomot.ru/uplcv?utm_term=creature+pack+v7_0 PDF link annotation
    • https://alice-immo.com/userfiles/file/komatebuvipogepagefopulo.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/126f27e52718aa304d36562a03ed07b1/50608138291.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/sadarepudidawejofitikobo.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2268c4b92---11494117032.pdfIn PDF document text
    • https://mgc.to/sites//web/upload/files/mojimevadovepukabujefilaj.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/75756633145.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///15694010995.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607270c03f2c2---vuvewuzamilo.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/0r8r1gni1vsf5uugpnoqq96p6s/xavetatoz.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/cs22j71u3hkbsep0ic8qd8lf43/18400564907.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/38eluba4e6n3msa3a318ce7ip7/sederigofedofizob.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/kikomagig.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/85747006272.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/manedejedesurem.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/92300804339.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2d9059472---xatuveruvevijibobuzorusa.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bac92ceea60---dodufabawinojisik.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/2vajc4cisv2jkcnf240d3rhcmv/34861836693.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/rba6jqg5775p5d42ob88rv2mn3/15187018778.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/burotegixejepi.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/d2218b2ecacc46b8c0019c0fe2c3407b/podefitedolegowemas.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e57b2deb3---sasoramiviwasowuva.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/levijakaserabuvuduvotomud.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/ritijiluwisatitexuninazix.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92F 10328 bytes
SHA-256: bc3e4ae871d02db0e964d024d5e0964f8a755ddcd1a443c8e0411872e6d1bbc3
font_02_sfnt_off000100c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C2 9924 bytes
SHA-256: 2acf33d08ef2209e2966659a5a30262042f32d9b158030eb268fa2da03aea0ae
font_03_sfnt_off0001211d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211D 19460 bytes
SHA-256: be2e69ba2c59bfb6ebe8acd52ac1e54493adb6d7b26d6a0bf4bdf67115785e2c

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