Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe9caff206dfa2ef…

MALICIOUS

PDF

135.5 KB Created: 2021-07-02 07:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53bc344c26a440bbf29a9b3d8a210776 SHA-1: c500b4a7ac78645d60a475ade425d8913dbb3706 SHA-256: fe9caff206dfa2efd9538f34bfe48c826e631787fb22387877584c2869d80ee8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9474

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://csom.cz/wp-content/plugins/super-forms/uploads/php/files/a49336f22605be337e4dcb589e77761a/14523165482.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88863996f7---wuzulozozemisunutibos.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/pivalamefunodepidabogewa.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7kk6q1c4clugtq0cl1b163d50r/xewub.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b9f0e00e6---sojobipalovedoduzubufamur.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc90f40864---62189707629.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed3af4fd1a---mulapajulawisapa.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ece20f589cbc6a4a777228125beda85a/gexuzuzapufawasela.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160de59aa4fc7d---bususon.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4318a2693---pelawevojalunalodirijaz.pdf
    • http://sjhrz.com/images/upload/File/letutoz.pdf
    • http://skogsformedling.se/bilder_umeny/File/puxelipopesopavemuxojig.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f212ec36bb---giridola.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/r53s71mra4opa63oc84ngmn7l6/lefagifatiduv.pdf
    • http://www.lebedosapartotel.com/data/yukle/files/wuwabiroxikifaraw.pdf
    • http://www.tobywells.org/media/fckdir/file/wevujodilof.pdf
    • https://tasivn.com/upload/ck/files/lopijeda.pdf
    • http://www.cafeinca.com/img/public/contenido/file/sesilogebaz.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c80b91595---77632758229.pdf
    • http://quaint-house.com/mizez.pdf
    • https://genegurumiraclehealer.comuserfiles/file/59249392260.pdf
    • http://arniestribu.com/campannas/file/84148134296.pdf
    • http://indel.sk/userfiles/file/43246369355.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=one+piece+stampede+free+full+video+english
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001167e.bin
413b284576c34c13af35a7e583d5d8118c600e5bb5120a9fcaad82d9ad034f84
pdf-font-stream PDF embedded font (sfnt) at offset 0x1167E 11256 bytes
font_01_sfnt_off0001308a.bin
de7ca1fa4e2f05f6f7412c04b3506637a6b295e7da9d79ec394f2f8216275a42
pdf-font-stream PDF embedded font (sfnt) at offset 0x1308A 16220 bytes
font_02_sfnt_off00014632.bin
62a44af67870555720f80f0b9cf3679342afc184a5c509452678045032116ce3
pdf-font-stream PDF embedded font (sfnt) at offset 0x14632 19764 bytes
font_03_sfnt_off000179e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x179E4 16792 bytes
font_04_sfnt_off000191f2.bin
821e70d225df08c992f2d80850fcdf4c533148bf3093243b5cd40ece0fe76167
pdf-font-stream PDF embedded font (sfnt) at offset 0x191F2 45348 bytes