Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0842df7542b26b…

MALICIOUS

PDF

68.5 KB Created: 2021-09-27 06:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9251817fc18f3085c69b400998a2b037 SHA-1: 6495a45e03de3a94a6dec6f69fd86337a65fbd16 SHA-256: fc0842df7542b26b71c3bb0d9209ef600a4b8441a93f0321a777c2212c8dea19
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which appear to be disposable hosting or compromised CMS upload directories. The heuristic 'SE_CALLBACK_LURE' indicates the document likely attempts to trick the user into calling a phone number, a common tactic in phishing and tech-support scams. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=passive+voice+pdf+explanation PDF link annotation
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613956a2d2fe5---87588427116.pdfIn PDF document text
    • https://eventaipei.com/upload/files/10399485163.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/fizuw.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/lawuwobew.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614df85f984fe---datibavu.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021927_74734_483.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/wijofumomubegilu.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/fepotijojugopabimim.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/93037030519.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/48032217593.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/pefinerezigetodalinezimep.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/relawavelike.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/92370950273.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/vefawimirilopumosa.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/12155500314.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/89584266052.pdfIn PDF document text
    • https://www.servicespace.org/inc/ckfinder/userfiles/files/kujodaxitovof.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/kevukubekenokanupa.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/zuwirumezazipodigaruxit.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/robisixo.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614175b69ef21---21811482021.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/81401846347.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_off0000acee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC500 15592 bytes
SHA-256: 56c013c18fde00316031c3988d7fc7d812264c18cdceff33e1fdf076f090f239
font_02_sfnt_off0000ec16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 10680 bytes
SHA-256: cd4f389daef41998e1fd8c029e383d40987a411a42d466729a28e52753f8b0f6

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