Malicious PDF — malware analysis report

Static analysis result for SHA-256 273461e4eecb7f7e…

MALICIOUS

PDF

78.5 KB Created: 2021-11-12 21:21:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fa4ba1f10de2794bb38abb4a1556fee6 SHA-1: fc4f96fcf4aa3d5cdc9ef37d089d736ccc82c0a4 SHA-256: 273461e4eecb7f7ebb280aab16010959ffdf3a69eb3f201de5882c32f26197c3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/41c2cd6a5d6362a2edc802da93d2ac95/86352781229.pdf In PDF document text
    • http://historia-bfured.hu/userfiles/file/gurimiboja.pdfIn PDF document text
    • http://ln2sc.com/userfiles/file/guxupimuki.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/vosuvirifowazosu.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/10346105641.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/gabololodutijagabokepiko.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/32625548041.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/pezazupedafibo.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/kemimotaxitizepaxotanavo.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16152860ca9103---92604453916.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/3505823491.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/67270474617.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/68394516162.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/mejemapikanovabiximidusod.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/nemavixabe.pdfIn PDF document text
    • https://oconecorisc.ro/admin/UserFiles/file/87146785403.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/fepisoxesupevokizazez.pdfIn PDF document text
    • https://felicityokolo.com/file/99395534855.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/32684283027.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20211010164651.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/cd5063cab1871f3dc960caf217b33be9/lufazolotoleladutuwop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/6Zflnl449io/uplcv?utm_term=fly+me+to+the+moon+acoustic+guitar+chordsPDF 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_off0000cb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2B 18952 bytes
SHA-256: bfcfc5e2e576b230a0c12fc1d6c0c78cc06fdf32826d2b14ec60747338fac1ad
font_01_sfnt_off0000fbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDF 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_02_sfnt_off00011305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11305 11008 bytes
SHA-256: 7ce49e2654af478832f61fdfc37202e1bff25f34667e8e09462945dcf19369fa