Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b37ecf3f81b6ae…

MALICIOUS

PDF

78.8 KB Created: 2021-09-12 10:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dd38f7cc9560df402e4892f376a93b84 SHA-1: 42d4167e6e24700577e82554b08078d7a382995b SHA-256: d8b37ecf3f81b6aeacd02dba9ca960e42f901dfec8b57bc10fbcd131e9b3ea01
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5306

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 https://synerhu.ru/uplcv?utm_term=watch+online+taal+full+movie PDF link annotation
    • https://dagvandearchitectuur.be/_files/file/vomelovat.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/wogomewuwadexugowulutut.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/80884062211.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/26564229985.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/vubav.pdfIn PDF document text
    • http://charivne.info/images/file/56396474816.pdfIn PDF document text
    • https://pecsikult.hu/files/file/tosugeluwexode.pdfIn PDF document text
    • https://seerupit.dk/assens/file/kizadomuwukipelo.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613581b4f0972---femitiv.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/pamosutixunitix.pdfIn PDF document text
    • http://fitviewer.de/files/file/8313884513.pdfIn PDF document text
    • https://equinox-e.com/upload/files/76234215194.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/nidexof.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/458984c86226aa309af48d5f62b71375/63328674476.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/73022790452.pdfIn PDF document text
    • http://biomehl.com/images/content/files/tesiwefikiwuvutekasasome.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/3i5t86vth8098n3c2odn7g697g/pobukufobasijomudefulan.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16139deaa8848a---43184178168.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/rusuvaxipaxetosevizev.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/bakofixogowiwe.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/mosenafokufakagax.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/39903407088.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/raxorigojoletotobefiju.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/bufota.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70F 10492 bytes
SHA-256: 5753b80a6a9c05ddf40e9c82d7b66c295c74ab44f9e47732b7056824efcd39b8
font_01_sfnt_off00010ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBB 17596 bytes
SHA-256: 093deef83c36072bff57f9a4e0a75611b641f5ab6e7da075ee422d7679953649

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