Malicious PDF — malware analysis report

Static analysis result for SHA-256 daea73b8ae49132a…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 03:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7b7e3d2e6bd0392f5747b19a9cdd1fb0 SHA-1: cce82b5d6b039a452f4a5a675ebf3dcb3ed976be SHA-256: daea73b8ae49132af1d6896b8c7307aa6bd2375d026f8d7ee2f483591cd1fb60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://bjjiffy.com/upload/54608484970.pdf In PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6a856b2c9---pelepevotepowadi.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/t1mo3ke0rrlr7c2m8vphdbs1u7/vanifijekes.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac5e57c348---bigiwiwafexopunamo.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/35335555845.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/62062439301.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/44599683024.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/97192614284.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/73697454809.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/betaj.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/d772414cc7350b6431658e8f4b41119e/94163856513.pdfIn PDF document text
    • http://yuha.be/_files/file/susogejesagujobovixaj.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/c070d1lk86t7dmo0d8ltnejld5/ruzulaverijabumave.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/vajis.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/ranasiwe.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/gulaketizizapamij.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121a32899ca6---70165957170.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b68da627c1882571561447e731081024/lomodufexovupemudevidom.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/4097806814.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/lojerexavafevi.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/723955292.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/kiluxuli.pdfIn PDF document text
    • https://lukili.ch/UserFiles/files/guxamizununawiv.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/53627367222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=variable+valve+timing+technology+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_off0000dda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA4 17600 bytes
SHA-256: 436e8a1acb0533d04b91ffaaa1d704d2746b330831aab0e781ab3efc462611a3
font_01_sfnt_off00010b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B19 11188 bytes
SHA-256: bb7c9a4bb1520258d42cbd91b681fc4febf141a911472a21206fb31577b266de
font_02_sfnt_off000124ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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