Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f237d908e05d4a…

MALICIOUS

PDF

83.0 KB Created: 2021-09-20 06:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 58d648dbf707441ddc500f759dd97cab SHA-1: 58292795a79316d2655019c70d89f2c6544c4db9 SHA-256: f6f237d908e05d4ada61d07f43a81499f70b7e080335ef9f998705f0e5fa244e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a phone number. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites or facilitate fraudulent communication.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://cuoredicane.it/userfiles/files/37459852103.pdf In PDF document text
    • http://ajeah-intl.org/fck_image/file/javelakurisujokon.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/dimufosopofumogajigiruwid.pdfIn PDF document text
    • https://congchung7.vn/upload/file/83316250900.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/68320881233.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146bc945b203---kujozasuribetizap.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/xopoxepufovorubixorarid.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/tawulesolejuxunip.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/20186204902.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/ee00435c3eec501d272453452027f7ed/72855750815.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/57770596921.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/puvofivewivilefopilenu.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/raroreruwodokisalawo.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161317634a947f---47088260591.pdfIn PDF document text
    • http://vucert.vn/uploads/files/nojofi.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/87295137068.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/53249899666.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/31789016020.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/burebatafonadomisatu.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/danewujinazi.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/79878174359.pdfIn PDF document text
    • https://timminsrenovations.ca/file/ag7Hq0VmSMZutsV4.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/12513120734.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/92455043704.pdfIn PDF document text
    • http://reflita.lt/uploads/files/vuzok.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/wogufupupubajujagofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+call+record+automaticallyPDF 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_off0000dd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2C 10552 bytes
SHA-256: f9fbaadc1e59c0d4ded8812fc958a54404bc73491285e242ceebbb34d28d84d3
font_01_sfnt_off0000f542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 18828 bytes
SHA-256: 09193fe3d1c3dda91da2749b91513f962a00f50e9b23526dfcac43fdea49c374
font_02_sfnt_off00012603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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