Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2710174b4bb0aa…

MALICIOUS

PDF

85.7 KB Created: 2021-06-30 11:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c9b54b587c4659bdaed56d2161cb9f7 SHA-1: 841dc8fe0563830570cfb2a411a7a30be7b6660a SHA-256: cd2710174b4bb0aaec893858894bf309c9a8a2ffed146818f4224645dd6db164
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/c0a6f3a743fc98bbf2e462768520f059/79270784177.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609883cdaac33---41727670947.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ac8fc686c---lenowenumosojadepuwa.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/40jdcpij78kltlgt1m6f90q0cu/93017801030.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d23b87908d---5482535427.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/c7d9c2c7da9618d72f21a800a25fbea8/wezamubulo.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160702e17dedbf---mevomufozajoriwapobek.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/cn5vph8buod7prmnu1o2b3l244/gedasobinum.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b0e97f115---31681345858.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801e98e6d79---xiralatugepaver.pdf
    • https://strechybenesov.cz/content/69663710191.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/9fb831501dede6130f16b07e294bbc1d/7769365984.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/8u3vi1s9lokonjhkau137f5lbv/pufuva.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b251647898---86310286332.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a7ddc286585de8e2ebaf2d85f2db3486/24107825013.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/ae146f25e04012056a093dba507b0262/12120244807.pdf
    • http://hyundainhapkhau.net/upload/files/49233629643.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce7ac1e380---piwesilen.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074ff474f720---pinanalurivogufodakulu.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/5ab1ab88ee9964bfa53af4dad7613560/worabalevoravakara.pdf
    • https://sahyadrisevasanstha.in/userfiles/file/1665488321.pdf
    • http://hayatteknoloji.com/webimage/file/mabidesogizawose.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=translate+english+to+persian+online+free
    • 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_off0000ee3b.bin
20dcdcc91f368de4eccedf965087b07e079f09655b7e778b6e30f7bb6ff8b16e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 16772 bytes
font_01_sfnt_off00011977.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11977 16792 bytes
font_02_sfnt_off0001318e.bin
0a0ed0fc607aa4eca60fb85376580d88c13f90d775dbddf9e351eff5ef596c9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1318E 10600 bytes