Malicious PDF — malware analysis report

Static analysis result for SHA-256 394968798e068710…

MALICIOUS

PDF

81.2 KB Created: 2021-09-11 01:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c1f6a00d3de838289e44562313a264f2 SHA-1: 4c9c6d8f8e352eb7be777fb0d5fe73aa77f89054 SHA-256: 394968798e068710775d867bbeb9b569a7df461649f31d8a544fcfeaaec77251
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pattern, where the document likely prompts the user to call a phone number. The numerous embedded URLs, many hosted on compromised or disposable domains, suggest a link farm designed to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=2020+first+aid+pdf PDF link annotation
    • http://sb-78.ru/files/file/19976242211.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/34467554651.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/40715054155.pdfIn PDF document text
    • http://synhbio.com/upload/files/79561962742.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/dijoduvunevojerav.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/3dc8dea9257cf273421a3d61c57538f0/26941933687.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/geponukefof.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/e4af894a888f5dd3c1214b19b5336435/7711916510.pdfIn PDF document text
    • https://parkettworld.com/upload/files/zexexasipajuz.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/89982472039.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/65719617133.pdfIn PDF document text
    • https://cncunse.com/d/files/71826916686.pdfIn PDF document text
    • http://kelsenator.com/userimages/60578745673.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/65897978918.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/pewubamulufitik.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/si2ncb75o7qemovs09kp2d4ah1/55592134613.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/76498448229.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/mevipevemotepol.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/suxasatigigovanurusiga.pdfIn PDF document text
    • https://melz-feu.ru/upload/kadodofopigivivi.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109040324256211.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/gukisosusalaxugas.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd3e3adb21---xajivifolukakutixu.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613207fca7fca---85958242560.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/bipuxelabi.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_off0000db8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8B 17260 bytes
SHA-256: 58ec0efab1af739004190d130d75e116cc0ad14ffe788382a186d9494cae92ad
font_01_sfnt_off0001082e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082E 10236 bytes
SHA-256: ec820152ee3c56b4b7edf70d595eda3434d396e9282a09ba99f2506f7477adcd
font_02_sfnt_off00011f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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