Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce2e4cd65b3509cb…

MALICIOUS

PDF

324.9 KB Created: 2021-07-21 15:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4ee4647043a3eb57712131bbef1724c8 SHA-1: 38698f10f8f29fad056730dc6b23895c9d9a7a13 SHA-256: ce2e4cd65b3509cb6dde1ced35da91181e8dbd48de113855821ec008f78a5a53
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a phishing lure, specifically using a link farm and an SEO redirector to disguise the destination. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were extracted, the presence of numerous URLs, many pointing to compromised CMS uploads, suggests the primary attack pattern is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8489

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/69idioj58uvb2d39qeb5amdssl/14478215630.pdf In PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/razif.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b56341e66---76272070079.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/sonelas.pdfIn PDF document text
    • https://combrooncom.com/contents//files/dijivos.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b6ecac79b---supozujepolumidamafojod.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/6vl8sal53tu8akft1sm70dr7nh/2694211712.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/sironapagolokekek.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/86555151337.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/galunadufo.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/fuxisinowegezokilajefe.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5f282c388---kadeguduwamupugevuzek.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/xifavitelirenepubodeko.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/simur.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/sifedajogorimubewikedije.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/kt1o1a3m885bispi4ose9cgs4u/sageridefezugusolidod.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/repedosaxutujabumuru.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/kufegifupik.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/9ov5j7eu4lvd6dped8uqvb4fs0/97343636904.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e13377681be---96125144006.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/j5ipsbj3rtsoa0cnkk633ojmi1/33333048915.pdfIn PDF document text
    • https://alula.com/wp-content/plugins/super-forms/uploads/php/files/cb91d3e5d47054b0c3496a1552f56db1/19740876259.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/14b48c6d9a8861b9251e5759d2db91a6/vigolaxejiwivaso.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/sgekpbi992p0ko8prgpfthdvl6/gatak.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/70671758374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=scratchy+throat+and+losing+voicePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00049db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49DB9 10904 bytes
SHA-256: 07bb7880086fed3b9928901eb074ff4522063cf5f6c7c3d6e29078e8e340c779
font_01_sfnt_off0004b6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B6B5 20452 bytes
SHA-256: c11363baf19f68312caebd4d903afcafbcfd1050bdf58a64a3aa9321ec058a30
font_02_sfnt_off0004ebba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EBBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1