Malicious PDF — malware analysis report

Static analysis result for SHA-256 937fee75d7b7c296…

MALICIOUS

PDF

126.2 KB Created: 2021-09-04 01:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5c4ade8a94177fc58ad8268c3ba27cdd SHA-1: de4c00fc1ac45161db919d9f97026f48aac2edca SHA-256: 937fee75d7b7c296d10b8481cce40eed9e0dd8b80056a6ac4506eb7575e310e0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a "callback phishing phone lure" heuristic strongly suggests the document is designed to trick users into calling a fraudulent number. While no scripts were extracted, the PDF structure and embedded URLs point towards a phishing or scam campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/ee09d03f0277397091cffd1a1cf27968/lewexironujovuzuzejo.pdf In PDF document text
    • http://fitviewer.biz/files/file/felisapuvutujipagikaxo.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/71137961369.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092910aa170a---katirilutovedikitureb.pdfIn PDF document text
    • https://mauspro.net/upload/files/6895987074.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607194d89d53b---sirodepudisulusonabewaz.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/0aa1f790e81a9a411f4cdac259b1a8aa/siweje.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701bead0fc9---98449149830.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d236cca04d---levonesupidenokexifo.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612599fba5f86---powasonopizapatitaronexib.pdfIn PDF document text
    • http://zuszdounky.cz/files/51122540734.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/38233169920.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/edcd4dcbc9f34b0e1cba1bdd2cc3b009/tefanobel.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fd341314528---bejulewa.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17b625a1da---75019114713.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/93613025916.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/bamurufuvamanatamudu.pdfIn PDF document text
    • https://norservis.com/files/files/14608043878.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/ronadizeligebejogedideb.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/pofejojebizijepe.pdfIn PDF document text
    • http://bronia.org/userfiles/file/sivujegup.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160869f65d81d5---lotobexijolidufuvodere.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/tavavusipufutakalatoro.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823d26099d7---73719643733.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/6699160364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=columbus+navigation+skoda+manualPDF 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_off000184bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CCF 20300 bytes
SHA-256: 1b6aea93756d5bebba5333eb8988b6662981dc3962d29117a09c4e6bc7694aaa
font_02_sfnt_off0001d1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1A8 10788 bytes
SHA-256: 58ba1d796e3bb48a803de7dbfb67a4cb771bd9985b14ca930276b3c4a17adabe

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