Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fc7ce4b3af74e44…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 22:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 346ea9dedcce2be03f1b8a4c67743324 SHA-1: d5eddb6863f3dd0c19c704a4aefb25878f985e36 SHA-256: 2fc7ce4b3af74e44da40a5d4007d137045fce3d17f9a684f022a96e59061c17e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and trojan activity. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

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://garglob.ru/uplcv?utm_term=non+pay+to+win+strategy+games+android PDF link annotation
    • http://stoka-saarlouis.de/userfiles/file/gedipazonupalepedanasalas.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/lowigidajav.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/53114070870.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-13/20210913082026625452.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/dovovegolizagu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613036cde659e---lufuge.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210913081103041698sla2w.pdfIn PDF document text
    • http://elsped.hu/files/file/67752454953.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/3013221009.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f21e1ed471---32912369271.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/rararited.pdfIn PDF document text
    • http://mfcpavpos.ru/file/pitexaxabakevisapuzeje.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/58457485035.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/mejugowojubopuwerivukudi.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab4867397---38428616256.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/95967074262.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/guzoj.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f331ede475---konatuterogowukasuxusof.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/12108644938.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/jakoxotodisowotilekupek.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/63222258941.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f77938f6dd---maxalekodosuzewogafoxit.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_off0000d808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD808 10864 bytes
SHA-256: 8a368b0b143bf4fb8cbf43c31d13fd97a1b5e44a8346ddf416b4e165d28112a0
font_01_sfnt_off0000f107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 17440 bytes
SHA-256: a83301b0c3b473bc7f110f9e5c6e5b7d27c68aad6232cde3c75bb37b7de7730e
font_02_sfnt_off00011e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1