Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ab34a7ce8baea72…

MALICIOUS

PDF

85.8 KB Created: 2021-07-01 10:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6eaec3344a5fb7da7928d8c4648c64a5 SHA-1: c91ba4a68d92a92374944f78391e0beee170e4ab SHA-256: 1ab34a7ce8baea72954e89a22da46452f61da110d4f5c0f28ae4ece2e8b3fdea
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The document contains numerous links to potentially compromised WordPress sites and disposable hosting, suggesting a link farm designed to host or redirect to malicious content. The presence of embedded URLs and the overall structure point towards a spearphishing attachment used to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • 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) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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 http://meechoktoolmart.com/user_img/files/tuputo.pdf In PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/q5rrlr3gkg01sh5875bohl8pg6/kixonafexagenatoziribixun.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/25377800182.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/vakesasewoxadofoxi.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/tanenanoba.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/4f0884a030ca535990c434ff8e2199b4/zilazifi.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6411109a2a---mobuzulixegunorezapadaw.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/dopolugegi.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/53629094272.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ce53f74d7da089ee0acbee5d29ae19de/35436878998.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0839bbeba9---2035811612.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/bo6vipel0p7lspjkgbujb02um7/99161535983.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/kosuvuxoji.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa03fdb4ea9---49445446455.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609271348e41c---dolutopowenawodo.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/cn870skho5pmq20snomp61dkh3/15254448541.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/wupebevulajedobuvidupaneb.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9dd19c500c681821594f0689562b020/14480106711.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/totawewenebi.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/cf3c2f7f0a01e50d7d24cb70b578b1b3/seziwizetusibuwemit.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6446b0db4---sexagowarowume.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8ff95a671---41934096715.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/voxerejide.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/cilb43qbk9grrlohp35ndfafjg/wovusupazozenetibujet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+reply+to+an+email+confirming+a+job+interviewPDF 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_off0000eb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001039c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039C 17204 bytes
SHA-256: c09f53943c6cda187107ffd04079d6d0079d4e483d8d225cd64b57e35cb1de7f
font_02_sfnt_off00012fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCB 11180 bytes
SHA-256: 2ba15c19cb92cc516ec89cf6a3edf8f9693de8a470cfcc20ee547583f6011a45

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