Malicious PDF — malware analysis report

Static analysis result for SHA-256 2277fb5da74a5b18…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 02:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d540ca5c277350bbde736e3600e66701 SHA-1: c3b4274f08df4839d2c050498c861af03d1b2fc3 SHA-256: 2277fb5da74a5b18687f334183007b7d4a5ac3c95ba1ed234c66a43315e4c162
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute traffic or host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=watch+justice+league+animated+series+online PDF link annotation
    • http://pwmtqatar.net/userfiles/file/basuvubezosobet.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/dotilawifipaxoruzunixuvaj.pdfIn PDF document text
    • http://mousike.it/img_ins/files/bigesuroxi.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/gisunenavuru.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/vajamigejaxiwejamivideko.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131572a52e38---37061337386.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/90004545477.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614068e227422---begelegifi.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/40227031999.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1614516201bcc7---zegerupubaj.pdfIn PDF document text
    • http://juentai.com/userfiles/files/45410583188.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/leletegege.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/b4617ea81ae94474cdb208ae2b68a594/vazewopomesiviremi.pdfIn PDF document text
    • https://12shio3.com/contents/files/tovemunone.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/4032965952.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/gufolizijasorufas.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613472b918cab---84879004064.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/libosu.pdfIn PDF document text
    • https://endobible.com/userfiles/file/koxegitinixovefog.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/8211838176.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/62937978972.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/3bc4slh6a4902lhqkovaef70se/89062129109.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/pawifuwinunovomosax.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/85939689685.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/76859111621.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_off0000d87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87C 18144 bytes
SHA-256: 0c4ed34852153be23168c5518705b3641274394a647162d902819a2a2723c1e7
font_01_sfnt_off00010764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7B 11040 bytes
SHA-256: d13aff07ccb1bdb73bc1edf9856125be2963bb02617d488e5abd2d21ef06ccd8