Malicious PDF — malware analysis report

Static analysis result for SHA-256 e312ba8281d47d6d…

MALICIOUS

PDF

86.7 KB Created: 2021-06-29 19:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 909d2e4ceda036375b9c540cf3d15c0a SHA-1: 672f45f0651474b6809f072f4083fcbb60f2030b SHA-256: e312ba8281d47d6d4da0c5c42f303eca6e61866afa902eb04c40a0fa7225f0cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to host malicious content or redirect users. The presence of external URIs and link farms indicates a likely spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/em1r8qbfg7jo3gjqckstcd6117/vimixowevajiwiwupemi.pdf
    • http://goldnumber.info/userfiles/file/84029352951.pdf
    • https://o2opr.co/userfiles/files/xewodujatuzudef.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078706ce1f04---46923928657.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5674592b6---63610135814.pdf
    • https://nic-irq.com/userfiles/files/damode.pdf
    • https://angkortaxiservice.com/userfiles/file/banugazapaxajuworepibif.pdf
    • https://justbuymeds.net/userfiles/file/32287112840.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ada266d4d4f---togafif.pdf
    • http://dok-vo.ru/userfiles/file/1470513994.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d40bfedf7e2---vimopox.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/3b677f342caaefd04dff364d5f22c14a/nunuzarutuzo.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/79f2dc5d890e370bc868995933cbfdec/18739142105.pdf
    • https://butchercurnow.com/img/shop//contents/jizosaviviramemofitugidoj.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b813431ba---dodupejemukofipofax.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751e67d1bd5---mokekisusepirevizunorize.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/b3141e7822c84f369d1f517dbd8be308/gajab.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082dafc6eff5---gararunorevit.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1aa5361251---mapasevupumeziju.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/711de2f3d844752c90f1aaabb436ea82/safunupixemobajuwovoku.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c0f84fcc9076de37891ba2c70ded1472/wagixugokuvemubokozesoda.pdf
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/dobenalifokufo.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6b29d980a---dojuvisiseveredifeze.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+annals+of+the+royal+college+of+surgeons+of+england
    • 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_off0000ed1f.bin
5e0ababd2d9e8d2acaa6cbf30b219bae342284e30ce01116870ab63e09f70879
pdf-font-stream PDF embedded font (sfnt) at offset 0xED1F 18756 bytes
font_01_sfnt_off00011c2d.bin
f9ec844dcab463434b1b8907a744ea5476705cfa0fad7be5830f35ce9ceb9487
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2D 10840 bytes
font_02_sfnt_off0001350c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1350C 16792 bytes