Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f7b8f07147c18ca…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 09:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 04cf5f6b9eb940a9531ad7cb71a76053 SHA-1: aa7661604fc602ec9a9369f78430bd071671dc37 SHA-256: 3f7b8f07147c18ca3cb755e8d9122f6709890e54e19a9ff138e1cfbcdc5cad65
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The 'SE_CALLBACK_LURE' heuristic suggests a callback phishing or tech-support scam pattern, indicating the document likely attempts to trick the user into contacting a malicious entity. The presence of external URIs and link farms strongly suggests the primary purpose is to redirect users to malicious sites.

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 https://crysiq.ru/uplcv?utm_term=alice%27s+adventures+in+wonderland+pdf PDF link annotation
    • https://vildmarksjagt.dk/userfiles/file/80441838843.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/otnbl0ufkbc8okec3gq8nf5iba/seludopopapulogojekarewo.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/96646739972.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/zixijikarowunu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2be048a57---xilimaj.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/77675246013.pdfIn PDF document text
    • http://dkind.net/userData/board/file/98760857901.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/89516848205.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/palaf.pdfIn PDF document text
    • https://n-tlg.com/files/file/61579580773.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/kururogotemabovivak.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/zoxizu.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/730217501.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/jarotaxoxenujijukitenatel.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/37569314960.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/10/19974793392.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613147f35c09b---gujuraxazaxibedezex.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/80865078915.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ut3nvurnud6tcaku8lfbunev5m/96739770747.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/sagezopebanewe.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/mopiwesozorunimowiboturiv.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/potanijudabifiled.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e761a2135---86944928490.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/19436230501.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_off0000df3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3E 10880 bytes
SHA-256: 6b0706b95ffa82673f499a5c9f60e5988f884f9b5e555edb073730c2b2b02c6f
font_01_sfnt_off0000f8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C0 16352 bytes
SHA-256: 5485136b8708713104cd20405d338f41fd8aadd13a98dee903164bc9c0058ad2

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