Malicious PDF — malware analysis report

Static analysis result for SHA-256 a204cafa25244c58…

MALICIOUS

PDF

85.6 KB Created: 2021-09-07 01:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1f5cdce3fe06711cfd07034cb7190736 SHA-1: 7f8cd17846db60b10f2fccc8b2d4269a9bf9e834 SHA-256: a204cafa25244c5802aa7e45fd50a75d3ca99727b1ee6f4554b841e33f2ce2a7
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised or disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the structure and link farm nature suggest it's designed to lure users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://yuss.it/file/rejojusuvetefisexem.pdf In PDF document text
    • http://amon-syotengai.com/userfiles/file/rotirataninax.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/sigizuzerejafufizadujux.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/12092668078.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/9a9dc3c9237c3c5b2064a58b94435335/vepovaligusoj.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/42483255877.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a176358213fb8ec0d0b7c2ea49931252/80345373529.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087910b88a24---32757066414.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/cd5f5a708f6dc972659b2b4d2a7af1f4/40888481421.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/52039300034.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/40231263009.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cff4029cf---22117081782.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0a8fa1c0a---67700542713.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/desumad.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/39080786730.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/piloxevajevisodoguwo.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/178286b9e7e8fddf816e91a4acc262f8/degasutaxisogavivagiromo.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f3b8f0996f0---40945494509.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/pizeg.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cb03a7898---lajobuperoxotunawu.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/10008995692.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/81439376255.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607629e2af1ab---99652452738.pdfIn PDF document text
    • http://klefmarken.se/upload/file/44883462057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=isolation+and+purification+of+viruses+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_off0000e923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE923 10732 bytes
SHA-256: a5381339f6597dba561f18c987c5bf48c033b3ad46b7a67d3f879dc086d7cc57
font_01_sfnt_off000101ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EE 17948 bytes
SHA-256: fb525fc00fed27e603e4b942015782e0083783b479b70f23b7396a6e45c3958f
font_02_sfnt_off000130aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1