Malicious PDF — malware analysis report

Static analysis result for SHA-256 91131a9a71a91b74…

MALICIOUS

PDF

116.5 KB Created: 2021-07-27 00:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5f22056305562c536768d78d9aa01c33 SHA-1: 3e534afada77f43e5983f92e4e0adf401f58b710 SHA-256: 91131a9a71a91b746e9b0c77b4baa25553b81f4ab0c98070e5dbbd3d497df330
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised CMS upload directories, indicating a link farm designed to host malicious content. ClamAV identified this as a phishing trojan. While no scripts were explicitly extracted, the structure and heuristic firings suggest it's designed to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3843

Heuristics 5

  • 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
  • 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://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/39f16f16be1b62f7f3664ba760346902/9717867414.pdf In PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608391fe466ae---lazawapobarudim.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/449aa3379bdf105eb23a6e9d7c990625/malumejopagagujinivul.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/12115060075.pdfIn PDF document text
    • https://haidangpc.com/contents/files/webewulipetoleledozatoku.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/25027630480.pdfIn PDF document text
    • http://minhanh.com/files/82880054912.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/78671282899.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/bunawurajebudu.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-17/20210517183403737664.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/45225194168.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/36752134772.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/wikaxozinivesidetok.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215181030524376.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/33b9f8e08ebf3cb19314435ee4dbd4b0/vurawowovofakisisak.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5de85a2fe---jewovuluf.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/2ebebb1e3b39e4aa228e08a3223cc299/dufimexanunigi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/besavotiko.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608213af1529c---kigewusupafovorin.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609100c47608c---47309671258.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/tusawo.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/xedunixubib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=oraciones+compuestas+yuxtapuestas+ejemplos+resueltosPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000153eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153EB 11004 bytes
SHA-256: 11f9772e6d21b6fd8b72dae6e492f21bd8bb076034d0d29e7a70ecd858fb8aff
font_01_sfnt_off00016d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D87 19004 bytes
SHA-256: 2226bbf4461f3f007878fb4b40252b0b9197cb35639d12e0662afd6aca119c31
font_02_sfnt_off00019d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D4B 16684 bytes
SHA-256: 5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d
font_03_sfnt_off0001b4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001ccf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCF5 2296 bytes
SHA-256: 7df7fa2e82cc03cc78273e3ae6ee1528e6bad376c331a052362e43ffef5c6963