Malicious PDF — malware analysis report

Static analysis result for SHA-256 39605b6c1dc31e10…

MALICIOUS

PDF

79.8 KB Created: 2021-09-09 13:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 111425d27a85bd0eb349ac0c64466ae2 SHA-1: c3c2705b0a76a14efacf6dcb45a024d4055c7e51 SHA-256: 39605b6c1dc31e10d49e638ce01b4c23005a7a2d14644835b7dd0615df75d54d
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to lure users to malicious content. The presence of 'utm_term' in one URL further supports a phishing or spamming context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://allytemp.ru/uplcv?utm_term=best+ps3+emulator+for+android PDF link annotation
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/9913950954.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/42065358790.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/bixazodebakewopa.pdfIn PDF document text
    • http://voijin.com/userfiles/files/77012095007.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/tofewa.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/51539c2d86a924aa7de800c173fdae8e/fojid.pdfIn PDF document text
    • http://vanhacollection.com/images/files/58358990786.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/86847024133.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/wobavirurojo.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/56202850186.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/48381028325.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/38626940346.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210905_34D2F0D1E2A990E9.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/65485008439.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/tedawovoki.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/lasafi.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/36329102296.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/a4r2ilpun27mq20lscnnidksq1/91898427517.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/594af27a50d82046698c7d4dea6fe07b/65965189730.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/vapawutunoxaba.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139546cc675b---savazen.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/04f05d58017e9763231bcfd557d9f563/dejezozetawekabevinijopo.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_off0000d60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60E 16420 bytes
SHA-256: c18e8ec82fdcf9a22b67b7747d6b07fb4c6d6c8b23119aa913248ebbe09fa8b5
font_01_sfnt_off0001008d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008D 10984 bytes
SHA-256: 74f0b2eabe06c553ec2ac4b2a163a674437549ee88db0de2af26f5df58bf99c9
font_02_sfnt_off00011a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1