Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08c374d95cb671c…

MALICIOUS

PDF

81.0 KB Created: 2021-07-22 06:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1f7e24b4a5d80eb5600e24712f30db5b SHA-1: 77e9e18a37dbdc0a7e8ddd9cf690d6995ac829c1 SHA-256: b08c374d95cb671ce2fcab13f78329a84dbe93c56bbd0452b5ddb06723c0e406
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The presence of ClamAV and ML heuristic firings strongly suggests malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e79768dfe1bfe5dd82ff093c3e1d944f/rikozabuki.pdf In PDF document text
    • http://china-zub.ru/userfiles/file/ruxadimotepiju.pdfIn PDF document text
    • http://ccsl.asia/files/60228226383.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/gopixivovirulugu.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5311e1c4b5---84851339926.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f8709f59ac44bcda9c3f1643a1908bcb/popevasinajafuxipafosuki.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/bbb3f15d466b441e682d5593fc69dc9c/35521402630.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/kozinapizuja.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e43535544d3---lotexusifuxusoditumevil.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/40583505806.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/wagizumasebag.pdfIn PDF document text
    • https://csn-alliance.com/data/files/sowubikexagexaguwu.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/9a1f139bf7d1708d53e3bcec29b289aa/nuvewepateremozevofemu.pdfIn PDF document text
    • http://dsagco.com/Upload/file/42460195785.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a74b6db919---duruvuxunaga.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/39080151406.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080448300f80---dosaxukalazal.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608557165279d---89150785352.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/fawetosabo.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/xozoxatekanusolaj.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/436243b9478869448995a685425ba478/47194408963.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/jetagiminogugefimaj.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/e74f9b15f52760cbbd1f84a5971f0eac/lutepazemetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+logout+mail+in+phonePDF link annotation
    • 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_off0000db46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB46 10608 bytes
SHA-256: 2b1f9fab0a466684b77f16312bc4786ec190be57ddf880f3411dbe7098c26fe4
font_01_sfnt_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 16424 bytes
SHA-256: 22bfe2e5b6a963b0bcf2de3f2cd0fdd2a27df6d4edce362c75753360c4a4f6c4

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