Malicious PDF — malware analysis report

Static analysis result for SHA-256 385ef7e5911fc25c…

MALICIOUS

PDF

82.2 KB Created: 2021-10-17 00:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 061b6a602303bd40ea022d6b93063dba SHA-1: 5a1f47d0ebfbdf8e4571fbafba5a78574a939e5d SHA-256: 385ef7e5911fc25c20ecaa06097aed2cd2dc5d0ceb497f4bf29c50127de03036
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams. While no scripts were directly extracted, the presence of PDF-specific heuristics and the overall structure point towards a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=98.5+is+fever PDF link annotation
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161407e3c0f0fc---21672729686.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/70769210253.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/fudizedifoxutezamixegoxij.pdfIn PDF document text
    • http://forestheightsgarden.com/ckupload/files/76236095665.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/57197873951.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/26368821494.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/3088443046.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/pefagonexijapudide.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/faselupulazijazasalosimup.pdfIn PDF document text
    • https://ibextrail.com/editor-images/daxowikave.pdfIn PDF document text
    • https://tsegypt.com/file/lonigevutewatipowimunupag.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/54320108625.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/totazaladi.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161558c8d22913---pobisupetixoz.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/muranukakom.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/woxizisusezu.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/eb76cf5e17cfd06308e427222d796943/kebozaraduvobi.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/rajamedavudozetuxoberuvem.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/bifegopedegananavutisix.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/umcpc05fsp0vlb41elv2s4kkn1/30155995739.pdfIn PDF document text
    • http://dip.natura2000.pl/imgturysta/files/rilamedunimiben.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/14235178659.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/71125049704.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1616b42849e68f---zudeluki.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/tijet.pdfIn PDF document text
    • 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_off0000dd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD61 17660 bytes
SHA-256: d470f4d5aa625bf7497d6dab06646f4ed65a41a2ec82d549b6e5a545d983a8ab
font_01_sfnt_off00010bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDA 10224 bytes
SHA-256: f3a4410277e3baf599fa73acff07f9075de5fbd9d50ad3bda35a571a0b5bef97
font_02_sfnt_off000122fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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