Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a0151b1fd1c3984…

MALICIOUS

PDF

83.7 KB Created: 2021-08-21 07:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85551231893d30174513db7a4bc2ec34 SHA-1: 98e05558fccb882814a6b9c8457043f3aeb45c76 SHA-256: 9a0151b1fd1c3984f421201a951fed4bec0af022e9bdf59ffcb46265e6471a75
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to compromised CMS upload directories. These links likely serve as a distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pmsp-me.com/userfiles/files/vimidurebabanunu.pdf In PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/6j00tsugt0muvcrerf20rfits6/81793752248.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/3us1qpolarcn634pevi94cqc2b/48297870131.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930fdcd4b43---36384450146.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/47573483873.pdfIn PDF document text
    • http://teknis.it/userfiles/files/rafawodufefetipejibuba.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/bikarujolidilowudopoju.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/nusefulejave.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/54812289164.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e42140c357---ruwaw.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075e90ca7686---33695471444.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d578bfae8---bavigetibigupusuxeb.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/riked.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/xopasurotizofojoko.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/88621893719.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/60765939330.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nomidamegotanaxij.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/9d32m5bjoot7p38neja8et620h/69215248209.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/f37496c008b460bb68bccfd1c55e2d8a/gapirulu.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/waxitifafidafagilepopobi.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/lokebomodato.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef139d464a---vemepareruvaram.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/golixelupep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=swords+and+sandals+4+mod+apkPDF 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_off0000e0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DB 17800 bytes
SHA-256: d07a824e9528a538faa788603cb6347ced2bb690d6ab7f1b3ee45a5a5b7b74c9
font_02_sfnt_off000127c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C3 10560 bytes
SHA-256: 0211a15552da843b115e98a845d88aff4c5b72a627b92d30c19d6a3169657bee