Malicious PDF — malware analysis report

Static analysis result for SHA-256 0746b55d15851b5e…

MALICIOUS

PDF

78.9 KB Created: 2021-09-21 07:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6324d5004b736618c0ebdfc038cb98e5 SHA-1: 989feea3c82fe79a20576a0e6758ba1c3dff463d SHA-256: 0746b55d15851b5e6fafbda078a7b7c4fbc9de17db4027cb252eb212f356ebe0
156 Risk Score

Malware Insights

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

The PDF contains a link farm structure, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the overall structure suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/e8cd25d79fa46d8312254cfcbfeee17f/fubil.pdf
    • http://naturalmis.com/userfiles/file/melabifoxak.pdf
    • https://bientannamhuy.com/wp-content/uploads/files/fapudolimazebogaz.pdf
    • http://ing-ka.com/user_img/file/13224384818.pdf
    • http://ventmetal.ru/userfiles/files/53743365282.pdf
    • http://www.pattyn360.com/upload/forum/files/tujoduduviwixexa.pdf
    • http://beveragesgs.com/userfiles/file/jikaxoziponokezu.pdf
    • http://sz-nuoyi.com/Upload/file/2021092019254952075.pdf
    • http://atlonnuri.org/UpLoadImage/editer/files/90746695869.pdf
    • https://fortworthdental.net/cmsCart/upload/file/51919167225.pdf
    • http://101-games.ru/images/uploads/files/92256263833.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613543b05509d---2819348698.pdf
    • http://archiw.gbpopatowiec.pl/img/upload/files/jamogojeje.pdf
    • https://fentesmakina.com/paket/upload/files/razokefonimi.pdf
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/23320791780.pdf
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/dejugererelebusisine.pdf
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/13620088145.pdf
    • http://bluecreator.biz/ckfinder/userfiles/files/74905231765.pdf
    • http://tingchucontrol.com/Uploadfiles/files/92713047022.pdf
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/bokevolabu.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/027b49703bd8d659008ee56686ec7373/kifofavejubewozirul.pdf
    • http://fernandopelosini.it/userfiles/files/15526669088.pdf
    • http://seghers.kr/data/editor/file/1461535428613f0245217f4.pdf
    • http://wawa757.com/uploads/files/nufovelat.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=bollywood+movie+download+link
    • 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_off0000d198.bin
1480d9b0157be8e668388216560884b62419ca654953f0b7f30e0fdff4a44f6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD198 10452 bytes
font_01_sfnt_off0000e94e.bin
459fa97ad487519ad02770e73f530ea648357a0de30fe93d09c75183853d51bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE94E 17348 bytes
font_02_sfnt_off00011656.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11656 16792 bytes