Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ae1e402c8c7b667…

MALICIOUS

PDF

102.5 KB Created: 2021-09-03 05:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 08ac25aea2f118cf89bd98a4ac9f3f39 SHA-1: 904b45124253fe7a39797273c4b5e189f132fd04 SHA-256: 2ae1e402c8c7b6673eeaf0913dbefa6b3a9f4f7f203a8fbbf8a4a0d31c493d04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://xtrafitcoaching.com/www/images/files/fezipelekelumapugomik.pdf In PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/80542073228.pdfIn PDF document text
    • https://tmtteks.com/files/sodipenozabadipo.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160939dfd10fcf---94989775363.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160727d5a33a13---dirupipuroma.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/janumevofeb.pdfIn PDF document text
    • https://reha.bg/content/upload/file/46715619448.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/82510125718.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/26903892722.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/c632812c69e744b1aac14b9c8c0fe0aa/tafofifujeximoz.pdfIn PDF document text
    • http://serting.eu/userfiles/files/25215601532.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/32644054492.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/62318743449.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/56a1ec5f00875ff0ea86d5e19e2c9943/lopotiduwijigemuwojid.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/luhhrjspg3i6q289s4c22rd4v6/14288060607.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/4093353622.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/favagubiveka.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/fimutakupevox.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610822762f481---73345893564.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/1p2if8ohj1pqr1u0i3ltdkmv4s/komomivulepatenokur.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b040635296---tilikobux.pdfIn PDF document text
    • http://artediapharma.com/upload/files/51228379613.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/vakabadozesofisa.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/60027670192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cours+droit+civil+des+biens+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010279.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10279 16928 bytes
SHA-256: 06389303de77b344a56623645aabb7082c231492d83b88bee741012fe4bf91d4
font_01_sfnt_off00011b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B23 25988 bytes
SHA-256: 462a7796d8b311b7a72f72de94507f7cbbf87645d49ed98d9a9870a5bc46f39f
font_02_sfnt_off00015ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AC3 10788 bytes
SHA-256: 3d089231e806d8e0c9e72295786604f8df8b63e2ff2ab355c5b4946d5c6823a1
font_03_sfnt_off00017390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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