Malicious PDF — malware analysis report

Static analysis result for SHA-256 336fab891a4f8421…

MALICIOUS

PDF

71.0 KB Created: 2021-09-04 21:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 29ca3d62b1f60fb68aa90b4f2bde3b05 SHA-1: cf316f3237290522fcd7c9010cf78cc2636070ce SHA-256: 336fab891a4f84219da5b0fdd5e926e36fb0a31d6e01583ba7f2bedece9317a1
176 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the structure strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://bagstyle.uz/images/file/telosidunutuwuz.pdf In PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0a4e79e816---ferevufibisexapexa.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/12527027838.pdfIn PDF document text
    • http://promador.pl/userfiles/file/japulu.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/mae94jf5p7qqpi95dpujirsonj/80523400477.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/d4ca13d543de5363695463301052f6de/tutomegadasofifumas.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a1105c3d0d---12858012245.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/xijizonolamamanevedibifus.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc6727580d---4823252457.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a660472c73---87791033115.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/kolen.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/xuwodepenisidot.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/23831475137.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/eekl7tbgrfs1puno8b8ap4hdv7/lamobiberajatedoxifunu.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/5omghj341eeisf4k2pqflun141/duvowimoliw.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/96492316369.pdfIn PDF document text
    • http://lawngo.net/fckfiles/wamunuz.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/a66ffaf1b272c5ec01239e38f9cd99ab/tizisusulegam.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/lorejejomubisibuz.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/940c3a1d801550437e7edc966444f596/piranubirodejivivizito.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/34940640994.pdfIn PDF document text
    • http://heyibnb.com/CKEdit/upload/files/kigumazafotawevotowaxana.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/gijamorakosozerapu.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611503ee6e75a---42864777178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=reeducation+coiffe+des+rotateurs+kin%EF%BF%BD+pdfPDF 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_off0000b74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB74A 10980 bytes
SHA-256: 7a3ab93a95bb1b751164319611a03d61de51b1df73fe49d86e59fdf5aaff7769
font_01_sfnt_off0000d0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE903 14052 bytes
SHA-256: 1040cf196d74898dc341da6ad7595ce9b364fcc65ad0819d09f364e922647412