Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd94e4e94887d96…

MALICIOUS

PDF

86.1 KB Created: 2021-09-08 05:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f380ea0b46bd137a0fef46ed3185ca44 SHA-1: 6b3282f69cfc93163b01782f00c5aba1a43e34b7 SHA-256: fdd94e4e94887d965a045381f494a445f9e351c2a9d93ca762c49d0e446ab386
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 phishing or trojan threat. The document's content and heuristics suggest it's designed as a callback phishing lure, prompting users to call a phone number for issues like billing or refunds. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious intent to redirect users to potentially compromised sites or host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://aeronautike.com/userfiles/file/latol.pdf In PDF document text
    • http://chayka-svg.ru/files/fovuxif.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/20783035163.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/datelowewegonogowiwod.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/9dcca33898e0ff3be043b5ede516f1bd/25772064480.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/lunaxovibasisaki.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/medino.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/1755d579dea163399184afb714e0ec35/26050149266.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/c3aa175dea43274c5c170d0c30b45ea9/23189116863.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/153197054a0bb993911fa5a52497a0d3/dokutujev.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/10971662074.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/1700225214.pdfIn PDF document text
    • https://tdfstore.it/file/15398189977.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wovokonomiret.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/lunapuxifiwole.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/lupijenamorumobuligozewup.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210902_145534.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/37658336608.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/58adolafd7lo07ko46ufa5uvg0/2954250833.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/28378622934.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608533d7adc0c---julozubuxukixupa.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/babafosigizoz.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/f9de22539a9541ae0ed2bcbf3ef1c869/renitajib.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/25916013644.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/ragiku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=gearbox+selection+for+conveyor+pdfPDF 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_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10402 17288 bytes
SHA-256: c88c06c9ebb07ae616057cc784e1572ccfc8ba5adf92a600f063933216e403fa
font_02_sfnt_off0001309f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309F 11076 bytes
SHA-256: 5c7763355eec2da60f20bd12dd477c774078930c4550c10d5ec8557325977b68

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