Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc940ad545af56e4…

MALICIOUS

PDF

86.4 KB Created: 2021-09-08 08:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 17380781a1b3ac4e5e1e4d97169da8ba SHA-1: c0aa34cb3963c0e7e0c49e765fb9ca140837eeac SHA-256: fc940ad545af56e4cc234965e4e0e6c77814fcec92fbc3336b5f87f2f372aafb
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to compromised WordPress sites, suggesting it's part of a link farm or phishing campaign. The ML classifier strongly indicates maliciousness, and the presence of external URIs and callback lures points towards social engineering. Although no scripts were extracted, the overall structure and URL patterns are consistent with malware distribution or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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://laborke.ru/uplcv?utm_term=bunker+hill+security+camera+68332+manual PDF link annotation
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f245da5da---xisuverolaloretew.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160783f679d446---96889529205.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/76932218348.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/9491611391.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/fomumoxori.pdfIn PDF document text
    • https://digireg.it/upload/86278999484.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d741d332e1c---feraxupu.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/kasujiripibatopezugurezi.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bac9313d0---53346528533.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/fazikuzaduwiwanexafik.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/20144031137.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/65503051049.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/42202966209.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/bilokapelilire.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/428d886f82d6a88cb7d04c85aefad091/kokajafadopudalin.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/8521317791.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/qhqoplet1coovgbbcje7ce845s/zakegazagorunujejus.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/jedidelilu.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/61212447808.pdfIn PDF document text
    • http://www.thaiticketmajor.com/static/imgUpload/files/55844132559.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_off0000e7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001000e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000E 11400 bytes
SHA-256: a528ef790c0a5e20350c127f05b00091f6bd1e82298e0058540d3cb8d552b9e8
font_02_sfnt_off00011ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE3 18676 bytes
SHA-256: 6e4c46b0dd84099dfb7f6cbd1ad650460fa5106fb4a0cfb4c9992ee017da713f