Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b93ca0f093a826…

MALICIOUS

PDF

86.2 KB Created: 2021-09-05 09:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2ceba32796e0fe3ee4b1953ed9ff768e SHA-1: 549a93e1617b6b18086d34dcb54993513d85b993 SHA-256: a9b93ca0f093a8262642fc2dc2f2e2ce80ff8e652e8c02025bfd65df2170f0ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload directories, suggesting it's designed to lure users into downloading further malicious content or visiting phishing sites. The presence of embedded URLs and the 'link farm' heuristics strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/feltpcm4p0spo4oimlcfjs039q/24554822018.pdf In PDF document text
    • http://biotledlight.com/userfiles/file///vadesuxu.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/05e9ebdd285ce4d01cfd6ff61e6d8566/belupo.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/15766329449.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/kinavefu.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/sujufezazukapanopogaf.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/wofosimof.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/69506571597.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/jened.pdfIn PDF document text
    • http://vanhacollection.com/images/files/gorogamagozulenek.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/63199067025.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608454d78b2b9---66916824436.pdfIn PDF document text
    • https://airbays.com/userfiles/file/rokigexoju.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-8-23/20210823145441997496.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/47689766870.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/612e8a506ca2a.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/4410253644.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/zuwokafogi.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/difomogerukotorata.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/78af7c2e14912053aecdc8088f878a50/jipidujutivakux.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/xamaguwezitil.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094db7132e74---gilaxuvunulovivabasufoku.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/28456828854.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b58878431---78239135492.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160877e57a198b---17417123496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=nayab+mamlatdar+exam+book+pdf+2018PDF 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_off0000ebdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 11220 bytes
SHA-256: 4548651d9174de3ec6671dc9525ce9e58165333ab3f61eba221e68e1082b29e8
font_01_sfnt_off00010619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10619 17260 bytes
SHA-256: ba283ce3e838b5a8f39929a82f16f442a5f685a856c43a4496783d90bed0bc39
font_02_sfnt_off0001331b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1