Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4dbeafb5f01565…

MALICIOUS

PDF

87.2 KB Created: 2021-07-16 17:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 993617cd039df4b482d34d551955c0f0 SHA-1: b788f71913d955df7e5f066b29e984d97568b45b SHA-256: 4f4dbeafb5f0156588be22d4354a134e16ed5d1db734ac7090318bd346889543
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to distribute phishing content or further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fcf764b01---52869458056.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/0005ae786d0c4386fe868d3c865fa655/tezar.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba93a85465---73464092396.pdf
    • http://taketty.xyz/js/ckfinder/userfiles/files/54673569868.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adef42cefb1---55385625729.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f12adb7b16---wabovefa.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/902407a2a695d805abe300b02cec9c2d/20463303733.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/4c31c528ba5a05e877dcd34f5c367a8f/goleditedavivemug.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9uu6cdtiopvidpu2jq7k6s42o6/81966716923.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c8abb09013f19760832ea26a18d786cb/77868596757.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ba90857ca---51456193481.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/af15233a9d38d22e70711c97abacc656/68133443086.pdf
    • https://fwullong.com/upfiles/editor/files/forosikonaderuk.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074286abd859---56078531514.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c281ddccee6---gawudejimowogewanuvoj.pdf
    • http://beiks.info/public/file/30069685211.pdf
    • https://atamergranit.com/userfiles/file/kosatepizinavazi.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f63d2d279f---kemol.pdf
    • https://catequesisnavarra.org/guiarte_userfiles/files/vojiduzorominawutuxu.pdf
    • https://ludifrance.fr/userfiles/file/71741540156.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b31d86c3f5---55331470632.pdf
    • https://dancleland.com/img/upload/file/12674238516.pdf
    • http://aranykoronakft.hu/userfiles/file/90979714606.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/1d57ad4fcffcfb0c1e820abd66684238/65720971713.pdf
    • https://samarpanbharat.org/trila/userfiles/file/81380851018.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=28+day+diet+weight+loss
    • 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_off0000f0af.bin
a36b09e6c0415c7898602ff87d7f620b1930437a9f8244b53d869a44f8f5f72c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AF 10756 bytes
font_01_sfnt_off0001097f.bin
c38b3ee8f3465d883f2fd2ea1f022f21ffc9752961bce2e7228724e44aa36241		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 17140 bytes
font_02_sfnt_off0001362a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1362A 16792 bytes

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