Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ac64d7f0a6e1b4…

MALICIOUS

PDF

85.3 KB Created: 2021-09-23 00:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: db5d0cc2246e93181e5d7353cb0a88e1 SHA-1: 7adaff5110e80edfcc7023f6ac8b3e35e84c0b74 SHA-256: b3ac64d7f0a6e1b4f9881299bb9d6a9b48c32525122419d55d954e43ac5e3279
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

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://krisoc.ru/uplcv?utm_term=news+icon+android PDF link annotation
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613a2b9bc4a50---67637627326.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7eafcb890---89667350348.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/zutuduwi.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/wetaxutufafi.pdfIn PDF document text
    • http://keramann.ru/uploads/files/41181113780.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/4286718572.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/kuxifowedopopat.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7osoed7vd3nkropjvcrpgnf1k0/kikoropinefikifirotokuzu.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16143ec358c82a---pibina.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/poded.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/46584502180.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/14702987862.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/nixoridevolu.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210917104821.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/wabitarujem.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-01-04-53-16-51.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/xowole.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///goregileme.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/fofivutuvoxajupumogokudad.pdfIn PDF document text
    • http://rhondachem.com/d/files/ziwitomevelumirale.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/siduzuzubemupig.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/sowadonemalogajoruxu.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/fiteka.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea1d1ad19---gerusuja.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_off0000e9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 17904 bytes
SHA-256: af515c865c956dcd6a15699ee5229aeca9bebeb142e338ca0276a646a41f1a64
font_02_sfnt_off00013043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13043 10280 bytes
SHA-256: cb153c2aa34068941613d6cd37865e6ab42cd0afe2df9cc9a9d4eb8d15eaf1f8

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