Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ab8a5344562bce2…

MALICIOUS

PDF

87.3 KB Created: 2021-08-09 04:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 00182060ae74dbf58a1c2d63a38e0125 SHA-1: 94bac8b91486941ecf9ff093a4eb7155e58275fe SHA-256: 2ab8a5344562bce299bb2192320adff61cacb6b5dc835c6512ff1dd87b3438a5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous external URLs, many of which point to compromised CMS upload storage or are part of link farms on disposable hosting, suggesting an attempt to distribute malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://crewmak.ru/uplcv?utm_term=libro+biolog%C3%ADa+2+bachillerato+anaya+pdf+gratis PDF link annotation
    • http://struttur-arch.it/userfiles/files/xojajujemujefota.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c305091dd---pugufukibawibavaf.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/86483577097.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/b07f19d904d57deb6fdecf40d27527af/24287709393.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/sibidonojisepokigibotirom.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/tubedal.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/32206567616.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/nr2va3ukfanshbrvnkuckmfjmp/62678455248.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/joletatunixekijosako.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/jajozulamuzosefufifibemar.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d6fa0f26e---20232423985.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607212c4d64f3---jezibezux.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/68067487289.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0a891ff4c---zegekuxamuzikizoxideli.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/lujaratepizop.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/43301197263.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609947a132452---49024310111.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/votetobudow.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/tojunevigilizewojamapaj.pdfIn PDF document text
    • https://menu2uplus.com/images/file/94896441216.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1lkt0kks45ri8lprbpbecd7001/14154365004.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cb54625cf---14763540544.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/dizaboramorimosupobonuw.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_off0000e8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E0 11292 bytes
SHA-256: 457c5ccb82f9ff7e7ef498c393629517e04a5af6ac6caf0f752611560db8b15d
font_01_sfnt_off000102f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F3 19328 bytes
SHA-256: 07a149a36713ff1e081440a50e0b85b8249c65709de564dfba107bb82e91c783
font_02_sfnt_off00013432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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