Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86a9e8583a94940…

MALICIOUS

PDF

91.3 KB Created: 2021-09-13 10:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3f109b4f672b41c0e641884c0d178dd4 SHA-1: 0b2522c16b6042c2ec7205b69ef167a30ddaa588 SHA-256: f86a9e8583a94940d0981628aa626dc7e2803bdacbd5a72ba1b3c1476efaea56
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous links to external websites, many of which appear to be compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection profile indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=english+full+movie+2020 PDF link annotation
    • https://pristineleather.com/userfiles/file/wopadirokifagarimipajuzu.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3283b88eb---36421527655.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/favozavefinen.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc155e5a3c---wibogasosevodapisokogim.pdfIn PDF document text
    • http://hadt.vn/upload/files/lonagi.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/dobofujijanufok.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/40220104836.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/netabij.pdfIn PDF document text
    • https://kermanrooz.com/img/files/96374179508.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/63600106121.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/84210450244.pdfIn PDF document text
    • http://kechengchem.com/upload/files/lizasexisopixexuduxo.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/90553068687.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210913105126.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/xinamepidat.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/zojibupevuwomekiw.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/b52grp03pi540hnog5ght3cch4/nowavezanerokedarolo.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/lobarelakutap.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/64072284738.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161373b007d235---nekiditidedirekazaza.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/joruwol.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-05/88bb2b246b2014203c6bbbfccd8a3ffd.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_off0001025a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025A 10692 bytes
SHA-256: 58ecb71bc49b2049db6d376962bb06a125092590024acd31d4a97c5baa06be3d
font_01_sfnt_off00011ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C5 17440 bytes
SHA-256: d0f0a1e7ff4f830a3cfed29983a550ab1c236e46d6fbcf0e86fc8354a1cd6041