Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e9b6228dd8cce9…

MALICIOUS

PDF

71.9 KB Created: 2021-10-03 13:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17cb469280ac46b5c933c2276da1e09e SHA-1: c7d5453f607df1ab77509ace766d6f879e4253fa SHA-256: 49e9b6228dd8cce9977127e4747e8d0732cbb27af7ce7854baebf07093ce2571
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URIs pointing to various domains, many of which appear to be hosted on compromised CMS upload directories or disposable hosting. The primary purpose seems to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=more+thirsty+than+usual PDF link annotation
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/giveg.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c52b6c781---38066131511.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f737c57928---dixife.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d496a014e8---bajetodefazivuxidefigo.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/muzitufafalakuzituwa.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/kurewavowaferigusozinu.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/30502271111.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/65rtgsm73oa2omnbu406qfh54o/88019173996.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/vajolav.pdfIn PDF document text
    • http://recviem.ru/img/upload/megogamezideko.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/c809bdd1ba71f5ad2f7affa12db1d9f0/21323420998.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/poduju.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/25326090441.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/93332863867.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/26944150692.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614099df610c4---67639399773.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/torud.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614f29270f039---27218691316.pdfIn PDF document text
    • http://bronia.org/userfiles/file/17273893804.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/65a6621da0bf6037e6da85f5e4923c73/62548784221.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/vidopifom.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/zazubuzatezod.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/ripujobelew.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_off0000b67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB67B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8D 17076 bytes
SHA-256: 60a5e81a6324556062c8d377de938a4eaa355ce2cb6d73c4c81dcf6b22443bd1
font_02_sfnt_off0000fa58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA58 10412 bytes
SHA-256: 9012fe77b08b59cae113f652ed28945f44b6d50016cf6d60eba49a79b3a8ee7e

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