Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab57fb688a21ecd5…

MALICIOUS

PDF

89.7 KB Created: 2021-06-26 12:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 876bc920df78b0f5b38783e886823e8e SHA-1: e4514b52890a0b2b0d7f2424fc24439492e345ca SHA-256: ab57fb688a21ecd53cea5bd1cfbb9ac416d1ccc64c79d9a08b5a366925218475
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs and the overall structure suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://alshamiltrading.com/alshamilfiles/file/13846662160.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/43325181889.pdf
    • http://bitite.lv/media/txt/122/file/jitijigaxusuzojutu.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c9ad3860f---30448930889.pdf
    • http://appletechsolutions.com/userfiles/file/31727197177.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/e859f22cfa4949ee279f5be9a224f6a8/zokodiwiluvatoxin.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee64af0d1e---derifiwununusideju.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeddabfdcc---85021816435.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b986677a600---dusegajewimisonepekuz.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/61rp0o68somi8fj8oalku0qk91/41970362419.pdf
    • http://elisa5888.com/shopadmin/upload/files/93622886001.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/beb492afff3ef28cf074928515b4bded/webeguketitun.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071a7e413104---96091625455.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2735a8c31c---vojotitezejunitapu.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607ef1e74920f---wuzuxozezif.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608d93246480e---wisozawuxoxazuto.pdf
    • http://hgbs.de/userfiles/file/4428881751.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/bc9db9d6cdc6c5f6574fb6909e32db21/1018612818.pdf
    • http://drairtools.com/ckfinder/userfiles/files/foxoxeber.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086c062b2350---wetuwatuvemijuvovesokud.pdf
    • http://aite-materials.com/upfiles/file/lewawusunaxaselupi.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/e309fb4d26a448c429299d3807106802/suvisowunigoz.pdf
    • http://popnmusic.fr/userfiles/file/13442703744.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c935a6551df---53684940887.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/8pe4sjrcjht63pk3hi22tgggqe/mivifitonizakasajitowasag.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=is+sleeping+in+afternoon+good
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbe6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 16792 bytes
font_01_sfnt_off000113fd.bin
695db5d0a10ba7b34c5431d7df8c7cc63e576c4f5f0a315cb6c10c84fd289316
pdf-font-stream PDF embedded font (sfnt) at offset 0x113FD 10624 bytes
font_02_sfnt_off00012c2e.bin
bb60fa09bec0e083e958120c4f8f24397a51f63703dcba6142ecf0185101c4eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2E 17224 bytes