Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce7a6fbb1178f1b5…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 20:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b26f34ac78c1a813a4c82df149c7550e SHA-1: 807fc8b60c91098b14acc77a4d12322d6beb655b SHA-256: ce7a6fbb1178f1b5bdfcc87963d6d146eb82162624c74d3d4a5ed3e77778d5df
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics indicate the presence of embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a phone number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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) documents that carry no urgency or charge/dispute escalation.
  • 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 https://crewmak.ru/uplcv?utm_term=4+letter+words+that+start+with+z+and+end+with+e PDF link annotation
    • http://cafesezony.ru/fck_editor_files/files/dujoz.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/ruvezorutobesozigokaxuru.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/fng09oabid13tsh6ebgf09jip1/zitaxefe.pdfIn PDF document text
    • http://p-energo.ru/content/file/96972666262.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/jezezegedematutefemalijo.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614731261f115---39208370076.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/misajotuxexarag.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/zeduvesodimek.pdfIn PDF document text
    • http://kite-surf.sk/files/xugawexodimawovil.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/51978546158.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/gisoj.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/taguvujetajitimaxunitelaz.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/bikusukezutizorivovar.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/33204498004.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a2f8c76a2---77473083264.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/15648036888.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/pofisegetipivazoxutisa.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/pupebusubuzepi.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/62432992316.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/65633534220.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/fesavezedabaguwe.pdfIn PDF document text
    • http://xsteelstock.com/d/files/22872986890.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be0389bbbd---vedufujasagon.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210917162152.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_off0000de28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE28 17388 bytes
SHA-256: 39f4fa0a5909a9d252301da31f15ec2c4bb5f50068cee77b05b67fc0bc5c0101
font_01_sfnt_off00010af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001230e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230E 10472 bytes
SHA-256: 37e9ec06b0f66076c72a88755fd1cf02ca0abde7ff2dfe60cf8e7259e1155f55

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