Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d3f53ba9c69508…

MALICIOUS

PDF

84.2 KB Created: 2021-09-22 23:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 968da016a090900618ceb4df95ed4d98 SHA-1: bd81a59b75b772e243c0692316fc514823e11698 SHA-256: a1d3f53ba9c69508801d69075b54bbc03e672d39892754359607fcd3f25c034d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to potentially compromised WordPress upload storage and disposable hosting, suggesting it's part of a phishing campaign. The presence of embedded URLs and the ML classifier output strongly indicate malicious intent, likely to trick users into downloading further malicious content or revealing sensitive information through a callback lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://namhungholdings.com/uploads/ckfinder/files/gifupemur.pdf In PDF document text
    • http://terezszilvia.com/images/uploaded/file/dizowaxabogojewunasu.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/peprdrdohh5qojfe30hmphi5af/fuvafunovifomofowulir.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/guxisinoburizisikevu.pdfIn PDF document text
    • http://trivio.it/userfiles/files/6366124212.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k4n8dr1nntkqa6covm2e57mpl3/foxajel.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/25547739423.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/doxuredodovaridatejaxogo.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/242316776.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/gopef.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/nilefadizetiwupegobomez.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/semopinogigupesolutu.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16321918833899.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/fivutunuvunuxixijegilom.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/39652276391.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/51781367261.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420c009cef9---27993710099.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134e989ac667---148577752.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/23621487869.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136db75ddff6---sutasatiminimuvigevizu.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/nomofatujuvu.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db0964357b---48930323662.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/17579042106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+get+android+sdk+platform+toolsPDF 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_off0000e40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40F 11008 bytes
SHA-256: 3ca785056a46774ac109bb47787d52e2066fb89c738e4614657f6cd7c6b69991
font_01_sfnt_off0000fd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11583 17940 bytes
SHA-256: 1912e9619c06d5e19ea218364d7d2215f39c533f43502819c95d26945fb12313

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