Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5aeb1232dbb4bff…

MALICIOUS

PDF

112.5 KB Created: 2021-06-29 22:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 07a4a78a6f28ef3310b0fe171c28d0c5 SHA-1: 8f9fa9205512bab76c1ff51fa50172027d00fce1 SHA-256: a5aeb1232dbb4bff077998ecbd49d27e0244aa5667b10f49ede2626de099c1f5
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. The document likely aims to trick users into calling a provided phone number under the guise of resolving a billing, refund, or security issue. While no scripts were directly extracted, the presence of numerous embedded URLs pointing to potentially compromised or disposable hosting services suggests a broader infrastructure for delivering malicious content or facilitating the scam. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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) or Microsoft license-boilerplate 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://krisoc.ru/uplcv?utm_term=engineering+electromagnetics+8th+edition+solutions PDF link annotation
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/23977569029.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/11672575802.pdfIn PDF document text
    • http://abnicum.com/files/file/xufigobaririvewevas.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160badac67b45b---30591938741.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/35813036635.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812c6777a3e---25348977591.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/a9219894bfe087c1f335b0815ef03d36/dumoxisewad.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ba63d4da2a7---xakenogazuzis.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/53f91c1bdc2f3d5677dd921a989ddd86/63319327355.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/90995905726.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/be0006b9f3f484621f9833d42badc8f9/biwevozagenukopudadus.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088fee7e514c---kejezo.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/79958604728.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14d3c3766b---vusudaralimup.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d14edccae5---83146147251.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/bade1e31504492ad4da24933d2f8d68c/nedaxirigib.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/i57foa946rtgued7g4hicjjhl2/11988458593.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/70030050394.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/8d55fd09988559185e95f5df52000664/torepisaziza.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/hs3vm1lt2pccmoiu2jmpssftf4/23564921708.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/76825875944.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000138cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CF 19340 bytes
SHA-256: 233eb806f1da948497a0b9afed12fd769efd0f5bd5336ed96e7fd11211d08bdd
font_01_sfnt_off00016bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BED 16448 bytes
SHA-256: e10c3b868f033566eb554b5c452bf1922245dcb0a751dddc09fd11bbd20a6794
font_02_sfnt_off000182a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182A7 11108 bytes
SHA-256: f9627184433ae6d7556ec5e5f956c799484414543359418aaa5b9c9c34e58ea8
font_03_sfnt_off00019c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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