Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f29c477e6fe9d0…

MALICIOUS

PDF

81.8 KB Created: 2021-09-15 09:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7384932786489f5874ee016b4c14b82f SHA-1: ab3576f6c2dcd854a700d8492401bc4ee27c966f SHA-256: b9f29c477e6fe9d04c6e4a35ba2d3e15155cee224dbd0ba2a7f0ae60f781f62a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple domains, some of which are compromised WordPress upload storage. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bhopalliteraturefestival.com/mpsdp/uploads/files/viwotiluvuwozijipalalotef.pdf In PDF document text
    • https://olterus.org/contents/files/fegexotifosidifuv.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/15739681180.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9d778147a---girajuxatofesuzibimimid.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/faroxafik.pdfIn PDF document text
    • http://evola.it/userfiles/files/donin.pdfIn PDF document text
    • https://insp.biz/img/file/jusufikotamazulugerim.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/wozetuluvaki.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/54822244714.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/75479465116.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/loxowami.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/6960592383.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/gaxesubosarofidilonijad.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/simutuliji.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d318069342---35838958348.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/85195456995.pdfIn PDF document text
    • http://www.bash.cl/media/file/65968844741.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/19c90277475c014c9d4350e94213dc61/nezezunamivatugawab.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/22663550705.pdfIn PDF document text
    • http://kechengchem.com/upload/files/78650921015.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/ruwunavifavevevozo.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/58393053801.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/vafuvirepisujawejezo.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/f74e959063f32b9b3eb509bb4fedfe35/48220395048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=diamond+rush+download+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_off0000d9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FF 18124 bytes
SHA-256: 221102ec417e9e0f9db7cfb2a5f92cb32582f82eae19b9198dc4d2bf9622ecab
font_01_sfnt_off00010906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10906 10704 bytes
SHA-256: d808dc414919632dc9e739fb9f8435947abe84dd764d5eade128a53ec5b642b0
font_02_sfnt_off00012155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12155 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1