Malicious PDF — malware analysis report

Static analysis result for SHA-256 868c978a24bbcace…

MALICIOUS

PDF

70.9 KB Created: 2021-09-27 14:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dca1e59b7659459645d5e7531b678481 SHA-1: fa17ccf85410946abdd02ca4d1f9707a6f6cd2a0 SHA-256: 868c978a24bbcacefcb29ecdd3d250acc33ebbbb15172ca2e9a38c2bd9dd169d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The document body is unreadable binary data, suggesting it is not intended for direct user consumption but rather to exploit PDF vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/57bad17a3f52149b99a3cc165336559a/54820757665.pdf In PDF document text
    • https://termoformat.md/img/files/zumazibomoweneniwerikuze.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f789f7c0b4---76433441691.pdfIn PDF document text
    • https://areicon.com/images/file/65237011071.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/88920889897.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/vpkadjan7adspqlsjuv4ocb04o/34121305268.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/87024703013.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/98580518058.pdfIn PDF document text
    • https://maria-galland.ru/files/file/ruwetanijupexutak.pdfIn PDF document text
    • http://4bx.pl/public/file/25016622950.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/peveburojezabozolotimes.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161519602ef075---tubalamononurolugixenevak.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/22466920366.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/52158838162.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/c0ad0f8da290261d8c7620e3884163af/lowawegezizagozufu.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/16715230864.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/pujetisazedulobugufutopul.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/wobejajorolitomed.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/zaxezu.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/satadisuviperaga.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/fuzagew.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/4e525f09d5bd47ba4407eca4fcfcf7bb/29527728624.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/munepodisox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=game+vip+ml+apk+diamondPDF 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_off0000b15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15E 10384 bytes
SHA-256: a13a869b2204dc198604f0ead9d5f62fb6ae33afc1d107c91fcc017f32333e4a
font_01_sfnt_off0000c8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D7 17108 bytes
SHA-256: f3815214bf316ce48a6d5824a97cc396d55e718c40260495fcb44d60da03af28

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