Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e10b05cd062751…

MALICIOUS

PDF

85.0 KB Created: 2021-09-23 12:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 56beb0193ec5de8e18ec8de10ba370eb SHA-1: 996aa18e74a9e0251140dd2e2d518f0b1963b39d SHA-256: f1e10b05cd062751acfa6802c617513e31cb3588c257a33f99835b8616c54a01
164 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links. The document body was unreadable, but the heuristic findings clearly point to a link-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://pujcovnanaradi-tvarozna.cz/userfiles/files/41820655178.pdf In PDF document text
    • https://amigo-shop.105h.net/upload/files/biladuja.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/51326154101.pdfIn PDF document text
    • http://acelybio.com/upload/files/zesalejuxariz.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133f83b0d3d0---sonimej.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/4664323853.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ahl51bl4tprnk2hv2bmcpushur/59425836495.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/rugepidinenisezefon.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/65827027337.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/fulibalotomavijakuk.pdfIn PDF document text
    • https://ccs-corporation.com/ckfinder/userfiles/files/85777266255.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16146b0ab450ba---mumajurimagulokotoruga.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/62732023659.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/472231432612fe025381c2.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/75657717004.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/40368394845.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/51807328576.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/patiganerawetofitifa.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/zogow.pdfIn PDF document text
    • https://airbays.com/userfiles/file/puvoripimobuwufemowinagu.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/rikav.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/02c5c810616558406740d67c46276f65/jipomexotebafadi.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/puwaz.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/zatetodazujap.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/rojaduvabiselo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=watch+black+and+white+love+episode+1+english+subtitlesPDF 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_off0000e416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE416 11224 bytes
SHA-256: e6f3fdbae019ae15ce9b65954c6169f3a992c513ba51dc547fc167c21fad4deb
font_01_sfnt_off0000fe10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE10 18384 bytes
SHA-256: 8cc423cc74f804df3b88c3678b93ee115cd12be204711625706241f78eaa6e31
font_02_sfnt_off00012dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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