Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f70b636e3384ea1…

MALICIOUS

PDF

84.2 KB Created: 2021-08-20 12:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9e93cbb11f6a119d81305ad03163eaf SHA-1: 863e8263c122d3735addac3e745a6c8fc8ef3782 SHA-256: 5f70b636e3384ea140b8d44a304a74fff27234e74683cb700512789ac064acb8
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, functioning as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://garglob.ru/uplcv?utm_term=condensation+evaporation+sublimation+freezing+melting+worksheet
    • http://thedewakohchang.com/image/upload/File/9385851866.pdf
    • https://annekienlen.fr/imagesfile/widikatotoriloxi.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/d2911unktdebu0djl5dv8dql66/78740734478.pdf
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/lewijovemibijeduxol.pdf
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/60972243830.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01ec13380b---zadorixiwidotafovoka.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3e15d3410---soduvazun.pdf
    • https://dienlanhhonganh.com/images/pic/file/kutovukutaxeripavujaxejo.pdf
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/kolakebulirivo.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/0o765rs8fm71a7nf1fls824d06/wonapenobijubewasifuravox.pdf
    • http://pileshoppen.dk/userfiles/file/futof.pdf
    • https://securitegenerale.tn/userfiles/file/9180986420.pdf
    • https://moveo-sport.pl/userfiles/file/rimoletem.pdf
    • https://smartcirclegroup.com/userfiles/file/pomarer.pdf
    • http://chinasoftcore.com/userfiles/file///surebuzedawelug.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adad11c7e7d---domuw.pdf
    • https://papiratisk.cz/soubory/ronijew.pdf
    • http://tragadsonisurat.com/ckfinder/userfiles/files/39599402396.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16084701de2004---66592766355.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608353b26af91---8556074500.pdf
    • https://bjjewels.net/nbloom/fckuploads/file/46862670451.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079423876c73---pilemisubivakawabozorir.pdf
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/97469347273.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_off0000e14e.bin
7430c5ed2ccba9f8ff0c82c461d8fe3f3d6bbbb06590489e0f95779be29d3cc0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE14E 11520 bytes
font_01_sfnt_off0000fc20.bin
e6afcf8dc6fa88392777b24bb79dce60c29286b99122ae5bd49351dd97b835aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC20 17380 bytes
font_02_sfnt_off00012a12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A12 16792 bytes