Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b2b20f5bc0f33a…

MALICIOUS

PDF

78.4 KB Created: 2021-09-17 06:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df24e5070d95d81ee53aba7117453d0c SHA-1: 38aa4d37a9c5ee027dd69ba0a6cf2f4ef7caa3f6 SHA-256: 70b2b20f5bc0f33a18d16ad12ef680e9f1c7d5caeda02561315d41f3b96345bb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. The document body is unreadable, but the heuristic firings and numerous unknown URLs suggest a link farm designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/50655672541.pdf
    • http://wohntraumgmbh.at/revitopasewumol.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613141482f846---wadorurorenex.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f38d0b438c---losolipaturejozusufatako.pdf
    • http://asupuro.com/user_data/image/file/xonenopeletonajexinikefa.pdf
    • http://lapenya.cat/imgjovesnaves/file/wefavasavofekipakopi.pdf
    • http://ihanzao.com/userfiles/file/20210907222531_2134271034.pdf
    • http://studiopol.com/userfiles/files/27098070941.pdf
    • https://angkaganjil.com/contents/files/megujexudatavoziwe.pdf
    • http://hk-bbc.com/upload/file/38300837003.pdf
    • http://lexen.ca/userfiles/files/37772149362.pdf
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/339443372.pdf
    • https://edouardweil.com/userfiles/file/83492105885.pdf
    • https://sdhouse.info/ckfinder/userfiles/files/74552632519.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/b41ac36ad84df051b3eb08985e847f52/mutosiliwavabokosol.pdf
    • https://vasantviharproperties.com/userfiles/file/febatoxumamotex.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/7691f75ea7596f0ee4b69febe1fd22d3/22574662120.pdf
    • https://pointvirgule.ca/upload/editor/file/30230755732.pdf
    • http://biondiairsystem.it/userfiles/files/96422014112.pdf
    • http://blackivy.pl/userfiles/file/minapenuxikuzuxudofexol.pdf
    • https://associazionemusicaviva.it/uploads/file/motali.pdf
    • https://we-plus.tw/ckfinder/userfiles/files/52282826798.pdf
    • http://imaginove.eu/data/Files/xaromime.pdf
    • http://bellamy.tw/uploads/files/202109021101083958.pdf
    • http://baggiez.net/userfiles/file/82200442358.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=life+without+bread+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cde4.bin
26593e3d0e9e04ac8f58e9733acbc780419986c40467b0002cc693fc1699f45e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE4 10560 bytes
font_01_sfnt_off0000e5e4.bin
a0bb214522748420b7b4e732ae9df1fb83d397e79fc1fe1dc99942b3ac62fb38
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E4 17780 bytes
font_02_sfnt_off00011431.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11431 16792 bytes