Malicious PDF — malware analysis report

Static analysis result for SHA-256 c079c7e2044568d3…

MALICIOUS

PDF

75.9 KB Created: 2021-09-02 20:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 718e8f368aa4bc6bc3553b6cd2b24a82 SHA-1: 553ba6e131c602614fe6b5abc09e14fd79674026 SHA-256: c079c7e2044568d3ca852270277d94056f515dc7e06c61dc79e9993107061243
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The numerous embedded URLs pointing to compromised websites and disposable hosting suggest a link farm designed to distribute further malicious content or phish users. The 'SE_CALLBACK_LURE' heuristic indicates the document may be designed to trick users into calling a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=church+hymnal+songs+free+download+pdf PDF link annotation
    • https://geneticapanama.com/userfiles/file/8182142038.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/40434598514.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/79262985314.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/56194537371.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/mixej.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/30319366055.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8de43323fb4302e71ec82d2704b234ed/65442430315.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021080521532077.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c949b89f88---xakofavis.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4a0b217fc4924f384f7210211d62733a/75378901801.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c88bcc07b---kiruroxo.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/kelijesoxu.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/010317b1552494ce566eccbd611b47e2/xofexegoja.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e7435c386af---84610072258.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/d12bd6968a2cfdea95589f8b953035a9/37105066439.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/rovoxiz.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/dadebovewa.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210630064900_emVrYWxhbmV6dWtla2F0ZXg=.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/69982783959.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9aff0b1be9a20af4ce9bfb371ef65b78/6815937740.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1610d4da97cc0a---31237549103.pdfIn PDF document text
    • http://quranday.org/userfiles/file/perogukanudafibar.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/6l3esvjjpn87n7sv9s0vcj52t6/sarazabezonu.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_off0000c24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24B 11208 bytes
SHA-256: ab5ae682374f6d4782d23d8fcd81ec005a39b484574f55c48fb58a653644ed4e
font_01_sfnt_off0000dc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC41 17668 bytes
SHA-256: 6cdbf0792ca3d7a2dbced4fd570008e7cdcc0ef4c225b436bd98ba1fc9c362ed
font_02_sfnt_off00010995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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