Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f3f2996aace0dc…

MALICIOUS

PDF

86.0 KB Created: 2021-07-02 14:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c3642e94964bd743746a90b4af3800ff SHA-1: aace10f9071c4e913f94608a84ff7d60512e17a6 SHA-256: c3f3f2996aace0dc71f0b5148ad0cd28b2e781004becd58d13599c06620874e0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of external URIs and link farm indicators suggest the primary goal is to redirect users to malicious websites. While no scripts were explicitly extracted, the PDF format can embed JavaScript, which could be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=forged+check+endorsement PDF link annotation
    • http://md-servicios.com/userfiles/file/53068515829.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/f04e5c708e6d0dd6bd5cdd723e0f5b10/35892860005.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d25015c6a.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/kevedatipijopupebirofosif.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/bosopalabubijotaxipuzavos.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acbaed0a7c---febiru.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/21455266509.pdfIn PDF document text
    • https://doganagolosa.it/file/12160100167.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/80167620462.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b286bc25a13---16955056046.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/08e44e119195abe9897dea5107b9345d/kenujok.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/37969346702.pdfIn PDF document text
    • http://www.bash.cl/media/file/tarujoferad.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884f2b0ea04---dutosinilum.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/zomorimosodedu.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/saxalebojesudu.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/58411578150.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/wanib.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/fa4c4eb0d1490acd6c0b118eb7405592/gomip.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/vuloze.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/gamis.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/c3l5kgnhjov088c5s6i98l0tc5/69996138559.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/gopiba.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081624f7e058---68799398484.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_off0000ec10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC10 10584 bytes
SHA-256: e72c946a6089b7eca797fc4816861f3c779624c2f4a14bdb11c1fbf3d5e1f329
font_01_sfnt_off000103d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D1 17772 bytes
SHA-256: 1a101932510b7349b71df1265820b05ceccd49b829be155d06efdcc29d169e79
font_02_sfnt_off000132b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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