Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa53211b1cf706ff…

MALICIOUS

PDF

85.4 KB Created: 2021-09-03 02:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 69203a7a5224f8615aab446a5e5b6e45 SHA-1: cea96a39cb8bb7d957ca4568814df7d66e7c168c SHA-256: aa53211b1cf706ff2f25e02380229d4a6a8c75df8bdc1e813ec36c61d84ca6dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to malicious content or phishing sites, potentially leveraging SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=uppercase+handwriting+worksheets+pdf PDF link annotation
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/7a9bf518dfad591caef9e91f29480cd1/vavufuwepogil.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/94374075650.pdfIn PDF document text
    • https://phuquiland.com/upload/files/91554269868.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/495fd2dfa5381574737729267b98305f/lukowowojetipesotusari.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/rejanexusixolexolarug.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/fematamenegalil.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/336bc8eda09d8ff347b126c3c316e2a5/78821631191.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/4ff07472bb2b5bca381dded4356aee7f/fekikademelusikomupewuka.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/sojuzesugefakamajapurijor.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfdc599830---gawetakegunufukuzulaneg.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e58637b8510---virezunadukobepasitotujaz.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/kizalodesup.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/42125697336.pdfIn PDF document text
    • http://linza-market.ru/upload/files/jalisu.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daa38b4c950---gupoxamejamovowaroz.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/67624230753.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/pepenitenibakuvu.pdfIn PDF document text
    • http://czyxchem.com/upload/files/56817554813.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160890fa9db124---16183502856.pdfIn PDF document text
    • http://iccarrentals.com/files/file/datizodi.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/wotikosux.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/jgc7ukhf94u9bgd5n4vbsmtmp8/vivuleb.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a00506270c7---vubitigamosojunavesenefos.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/99fb3c5c53fe46814649868085b451a7/javegelajokerax.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/14963464882.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_off0000e196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE196 11036 bytes
SHA-256: 31a27aba09aff22e521768eca6ad47b4344ac18bcbb5bd194c83714ffdae9769
font_01_sfnt_off0000fb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001132b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132B 20428 bytes
SHA-256: e7668c2f452815be85268dfe8e80a4eca237badf18ac4f37ddc0018105f3115a

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