Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cb280964d30bef…

MALICIOUS

PDF

72.7 KB Created: 2021-09-24 12:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 85e1cdbe582556811a95c4f389aa5403 SHA-1: 521a48db74ba86016b1558ce45c17ff515dd11d1 SHA-256: 37cb280964d30bef86906c605b3a20dcef321e15bc96b1c8eefa765783e4db6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://ebbers-schilderwerken.nl/uploads/files/mexokoxuda.pdf In PDF document text
    • https://tannhatviet.vn/upload/files/xunanisudegovofa.pdfIn PDF document text
    • http://deauville.ru/files/file/52197360024.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/53427576709.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/29215441408.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/vhkimo4ghesk912jevsofbm01n/jigox.pdfIn PDF document text
    • http://geodez.com/pliki/file/95832712848.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/76709551912.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16146a5d690419---tegimusasezaxa.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/derupupubadigimuwot.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/sofuwesuzeridufoba.pdfIn PDF document text
    • http://apvn.info/userfiles/file/12966166758.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/73786129653.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/wawuxapedubos.pdfIn PDF document text
    • http://maksimetall.ru/files/88018726789.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/22309929162.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/gumifigikokudizumef.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/jexefutodurinopununo.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/3174547295.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae4812ac49---ximuduzelidadi.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/nulegugugefutugoveki.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c47c693d9f---19765509316.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/vegefazenabubom.pdfIn PDF document text
    • http://medigroupvn.com/upload/files/86098082313.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/bixazasevexez.pdfIn PDF document text
    • http://firsatpin.com/calisma2/files/uploads/rabatefemufemojidikakuwin.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/xesuposop.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/kelerim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=sync+iphone+messages+to+androidPDF 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_off0000b7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DC 11104 bytes
SHA-256: 28105b07280bb658bfae75380882a9a79d15681a0160981ef82172181849c409
font_01_sfnt_off0000d165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE977 16900 bytes
SHA-256: 75c61d3fa062f133280c499f691159a1d510fa8f5baa3d3f52f772f6f094374c

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