Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f36acb22eb911bb…

MALICIOUS

PDF

77.8 KB Created: 2021-09-12 21:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: abef76e3941a60d7209ebd4fb72aad89 SHA-1: 789045dbf7dac9ad8bf1ec1dd1e5e09d8a9695fd SHA-256: 3f36acb22eb911bb297066377aa780129a654ff6fa79be390ceb7c0a9a0cb35c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The presence of a Google feedproxy URL with a 'hack game download' term further supports a phishing or scamming intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133492ca1247---kefujigafitotez.pdf In PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/22232491218.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/qe40ajalml0mtr8kcjpp8efn5l/92155317885.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/4333f459434f806f349d7d1143333968/lekedupiniwinenetufalijub.pdfIn PDF document text
    • http://serting.eu/userfiles/files/84143514599.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/gugisenu.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/murifoxemokikedij.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/86352958210.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/fowupozinukotatosinos.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/fixetalisa.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/2135288459.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/2102146327.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2bd2a88b5---60810947505.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/71124690492.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/44935037103.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/7984942991.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161341024e056d---delakep.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/gugexikijope.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/3797c4c1bf073c948279b83cd070c5e7/34481342652.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/digorazivatufetixofeb.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302d8623adb---kavubufoxapun.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/vedadotatokibi.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161341e2415eff---gonugoxotidege.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/mijawenem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=turbo+racing+3d+hack+game+downloadPDF 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_off0000c972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC972 11104 bytes
SHA-256: 88cf7f4b7c24e620a9e50ee44e7e94e66a4135eea9296ac88d633a00e99a5afd
font_01_sfnt_off0000e2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F9 17888 bytes
SHA-256: 301c50505fc77a253d5c6abdb961b6e122f8eac8287880988aa06796409af09d
font_02_sfnt_off0001119a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1