Malicious PDF — malware analysis report

Static analysis result for SHA-256 353139844722a113…

MALICIOUS

PDF

90.8 KB Created: 2021-06-25 17:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d48826e186d2e6b1133feb09ccc7bb7 SHA-1: ec6a6458d29ec83620a9deea34258fe5db52fa11 SHA-256: 353139844722a1130d4187400de878447d21335c935e2c6ece1cbb0de112397d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many of which point to websites hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71ecc0beac---jiboferevavejipisapuluj.pdf
    • http://jfac.kr/ckfinder/userfiles/files/ropagewituvilavosin.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/7vtcs15m1049sqspejf7pgmkk4/mupamuninop.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/7r94a1aslv4n6paalfdd0j1sgr/79484714456.pdf
    • http://becucci.it/userfiles/files/22513217974.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c590cfdb0a1---53597146276.pdf
    • http://wjvanderheidedienstverlening.nl/uploads/file/dodawomefoniwuzesimilaju.pdf
    • http://gpszone.hu/upload/userfiles/file/30278497347.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/i77s0u552mcelt2b8rh50cf8l1/patazegozegasuwanilixujab.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/58e6921a957698b8c8f6276d6bfbc0c1/13199521167.pdf
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/26ces680bmjjh0totfgr4htbpk/22727202470.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099edfb9c0f8---6673202880.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16079de46a24a4---86548433717.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/b23f4ecc9df0417b45546617c41ced62/60112634501.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2d62ee56a---96665369103.pdf
    • https://lifo-sea.com/ckfinder/userfiles/files/39976474716.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6a2b0c974---38620555097.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/a2b4d04b553c23cb3cfcf6067e5a78fc/nareleleralipamutuzotar.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/30cfb6865901068e9172ed4765fead3a/93578687934.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7e0e71ae6---sonuni.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769386154ac---bibiputevuj.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/676ba96f03e7e77e7071ec0180643197/79273899748.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/17059a983d4f636982002a832b1c8b87/48444664106.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f37481ffb---pivalapuvuzifowex.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=wow+classic+ret+paladin+pvp
    • 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_off000100f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100F4 16792 bytes
font_01_sfnt_off0001190b.bin
7add5a03adc7905ce355c09bfd706afba2e9814e1bdc0537df7cc81e369d09d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1190B 10652 bytes
font_02_sfnt_off00013197.bin
e641d219d8477ca184ecc2fc3f253deb4945b175bdba68be64369240b4c1cde1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13197 17100 bytes

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