Malicious PDF — malware analysis report

Static analysis result for SHA-256 5174fa80b5d5b8fd…

MALICIOUS

PDF

80.6 KB Created: 2021-07-23 13:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef2927434d8e5910bbc4f0d1ec4956a5 SHA-1: 13696a6cd059726f81f0b193f6f74c1a2987c6c7 SHA-256: 5174fa80b5d5b8fd95d497a0c3bbfa1a1180420f08e9280d852d688b023190ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/qkm8mjc53hscvopl85tsv8qgo3/kawomokafa.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/5a72aa228e10642a1825a563c1ecc875/timukipetog.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/sod6e45hm3c318aq0unqmeh3h7/xejokonowademomivameru.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e42156997---fajakebezilapugar.pdf
    • http://streathamtaxi.com/survey/userfiles/files/74363018929.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a94392c5f18---jigewiwesoru.pdf
    • http://instant-image.net/UserFiles/Site/File/gexusetovupuvebi.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dc041b84e2a---lalubupukazugosipog.pdf
    • http://steakclubhn.com/campannas/file/97281444022.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098adf21b40b---dorutufarolope.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/ggadrvj8mid49717fslsliljh6/mevodofavofewixorobi.pdf
    • https://rybczewice.pl/userfiles/file/71399006425.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868165377dd---51656345661.pdf
    • https://vegas-shop.net/uploads/files/betorovubekepedagut.pdf
    • http://agrobud.net/uploaded/file/jukago.pdf
    • http://cuacongtudongbinhduong.com/upload/files/navorarigevom.pdf
    • https://koratspring.com/upload/file/jumatabimobetamej.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/bozurufumigusojibidug.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/ef7105ebfe564c75356709566b1790e4/vituluguw.pdf
    • http://asesorgubernamental.com/images/file/parixuzadu.pdf
    • http://austria-ex.com/images/blog//file/sekewotowokijo.pdf
    • http://tienhasteel.com/app/webroot/upload/files/derapi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=world+history+enlightenment+thinkers+webquest+answer+key
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d67d.bin
37c67af3eb1aa44d26897df9f350cce3ac5809a17900f6a0d3cab60cd82453bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xD67D 11368 bytes
font_01_sfnt_off0000f09d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF09D 16792 bytes
font_02_sfnt_off000108af.bin
1599df166f12792aec0fe5f8ee728cbb170b0d419e547c4ffef231ac471fa62c
pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 16912 bytes