Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ac955a3928b5ea…

MALICIOUS

PDF

86.9 KB Created: 2021-06-26 04:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09c4868cd4abdf649c5cce732afd1a8e SHA-1: 02667aa813a3c4fdf8579351c91c0b157d7d1895 SHA-256: 41ac955a3928b5ea56044c2dd2f45b9b54087a2859a6ec2fad60a99af2f5b289
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites and disposable domains, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=student+cares+act+grant
    • https://lenaoyunlar.com/calisma2/files/uploads/nejaze.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b429e238cc9---taxuladigud.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d185deb787---32516359810.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9ffd5f7d4---jitedoleme.pdf
    • https://juhaszautovill.hu/userfiles/file/jetupixizipav.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160715f3862486---gefarojimiziv.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/hoviq7o3j57ah2k6efk99qrjjb/defojof.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/l37q6tma03i54cgkbb9cn3uuhu/ledujejimurigukunaxudon.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b0840f978---losugabumitibi.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078ff49e54ff---silodatusozulibepirod.pdf
    • http://atut-biuro.com/uploaded/file/78340303180.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e29b80c67---tiduxovudemokexabu.pdf
    • https://amitadevnani.com/userfiles/file/jajalanijodaladezus.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ad788e79dde108f9282b36818e3bb73/zedipokusi.pdf
    • http://aliceinformaticasrl.com/user/pages/51235920376.pdf
    • https://tailormade-sales-marketing.com/userfiles/file/14423222073.pdf
    • http://azizolace.cz/images/file/sitovununa.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/3a52f8c8ba5017550cdf6012c086dc3a/22141020252.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901318af98b---38280880430.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d113ee9c07---61072858230.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/69359ea70e117356705048a94a58f3e0/gotopilewa.pdf
    • https://amatnieks.lv/pictures/image/nosike.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/bq9c7kdseaq4pit4dpvr3tai36/7559444984.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862b7e724ad---48708348243.pdf
    • http://trustarshida.co/cache/fck_files/file/25309231193.pdf
    • http://curry-box-deluxe.de/userfiles/file/60565229388.pdf
    • 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_off0000f16e.bin
c460b0abbc7bc28fa899e974beff89f501ebb97a1e2150c605786c21203aca8b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 17280 bytes
font_01_sfnt_off00011e57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E57 16792 bytes
font_02_sfnt_off0001366e.bin
3536ee8dbadd127815ae17ab55281cfbbc43bcb12b5369ccaf389f5efaf5fa2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1366E 10460 bytes