Malicious PDF — malware analysis report

Static analysis result for SHA-256 660e03494b29fe99…

MALICIOUS

PDF

106.4 KB Created: 2021-09-08 11:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3a507468ea0adc28c3aebe768b08506c SHA-1: d92575bb76b9525c7df4ee486a6796161e0b084b SHA-256: 660e03494b29fe991075c6a07f0755a6106e912ded48e675e721ecf8015e35eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links, many of which point to compromised websites or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect the user to malicious content, likely leveraging T1059.007 (JavaScript) within the PDF's internal mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c64c300c4157d13d771d8f6dd5e3eee9/wonabotegepisimoga.pdf In PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/16210258219.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607bce8350b07---dowokagokapezunaxusut.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/giwemepedopotagori.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/fiwuminipunerepojolal.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8fae360cc---kabegizususosan.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120527cc7a56---91161844505.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c61ef31b8---batupuxerumakajonij.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/9a6183526cb3b34149202ab84c2487cd/41700326066.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847e781e432---besovaworijerupetizabonu.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3ea273a59---kesoriwasan.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/a1cd98dca570196b53f8508a0b002699/36725144821.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfc87ef442---16201771584.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f8e93c0c9---nuzowipu.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/98341395992.pdfIn PDF document text
    • http://3sdent.com/upload/files/gubufonufotozamupafozid.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cf55e77ec---tovifidadageluxavoxumuxik.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bd23ea163---49914138278.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16102ef93aa957---22815121141.pdfIn PDF document text
    • http://pyhunlian.com/uploadfile/file/jodepagodo.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/salor.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/60051721972.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8265e07bb---lunolumawujafokidapupisam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=basic+database+tutorial+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_off00013716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13716 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F28 20024 bytes
SHA-256: 9992eb351e0745656bd0e9fe5bdf5e11e01616173e9d0b1a235f46e8f931754c
font_02_sfnt_off00018300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18300 10800 bytes
SHA-256: cb5b38c4a2a29231bb50e81d33f6970790276efaef526ef7df5ef4df6ed24bef

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