Malicious PDF — malware analysis report

Static analysis result for SHA-256 3399b5fa3d8fe79f…

MALICIOUS

PDF

83.2 KB Created: 2021-07-29 17:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 30a25f33d7f7baec6530eb03655b711f SHA-1: d7523d1eeece4beca28eb38763fc31c99618af42 SHA-256: 3399b5fa3d8fe79f6f8032c955af7ecc489e850a49f7f0f0679cf2722f772495
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to other PDF files hosted on compromised WordPress sites. This pattern is commonly used for phishing or to distribute further stages of malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://huntic.ru/uplcv?utm_term=is+ni%28cn%294+2-+paramagnetic PDF link annotation
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160de942f09da7---29678568465.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/de7c82cbfa6bd04a3890d9c9c772b4ab/71369126991.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/dalibemozup.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/kudetulevurulifejaji.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vesub.pdfIn PDF document text
    • https://tekartltd.com/upload/files/wogotidozalevoxik.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e92d964ca4f---ligajamovafidagakozut.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/robimezix.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/12ff41d215b28470cc86898526c65183/zivofovabufepejojog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd6e45846cf---mulevi.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/pitivekofaropek.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/65380258242.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/13645788595.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105282356298304.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/lifigologedo.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a15a8bebd27---zaribufawokifaborejezejob.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/lonari.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9ed90b90f---jufepinukaninima.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5a715cb2e---72699500173.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3ccc03bc---13665330147.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/84575102324.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/xujorej.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/6e5145b8d46ad4b102d9060aa460a1fd/94306261337.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_off0000dc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6E 10888 bytes
SHA-256: 4720c101d66307850dd117a81c6d4e7d8c9a4fec8f26644c9e68d1e96eae1141
font_01_sfnt_off0000f5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E1 18064 bytes
SHA-256: 03ffcaba5673ee715cb8c0f421b071e605c5d9eb7b5191612082efe929cd7bb6
font_02_sfnt_off000124a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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