Malicious PDF — malware analysis report

Static analysis result for SHA-256 49c25eed7aca2099…

MALICIOUS

PDF

123.0 KB Created: 2021-06-28 05:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5d1284ff382752c99cb2dd63340a5fcc SHA-1: 0c4ae14f6c9ba6ab6be1cb4fd8f6040e3c886261 SHA-256: 49c25eed7aca2099852351824110f37c24aa19a67fd7473eee8eefc5dda39b60
156 Risk Score

Malware Insights

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

The PDF was flagged by a ML classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised CMS upload directories or disposable domains, suggesting a link farm designed to distribute malicious content. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 http://okuninka-biale.pl/userfiles/file/jugabelij.pdf In PDF document text
    • http://liffeyartefacts.com/fckimagefile/file/99909747669.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609252f8879d5---bopafibasefamupixomud.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/1b2d99e842b556d0d8f9d535e4279dfc/24164364256.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e378cbb36a---16216042159.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c7903120---65331288784.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/loguze.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/dabelunijugul.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/kagofixonalikebobof.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d90f9d2a8d1.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2c71b4c2ec7a39796155c262453b5e72/76395687417.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160983096e2d6d---tiferigajogirediwusa.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/buzozegazamunopowe.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/66721854863.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/86172583487.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/fm2f1vc4sue56ba95uk08cdsc5/volizapagijosaxow.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/vanebipidenogasa.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/87ff966beaf62e58cc9d473c0aac38c8/kuzugepelumemodojemov.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/sazodepusejusosejexel.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210625210531520808okwmeh.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/gafoguzerowaduzopegowapag.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160728369e39d5---94698387522.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/fbuv5frael0ns6ehqhmnh190ga/27943268793.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/fazux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=consuming+meaning+in+englishPDF 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_off00017852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17852 20488 bytes
SHA-256: 530ff1272443ff0425263fa66b8a2246eda0eceb679c1867be1025ee58148706
font_01_sfnt_off0001ad56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C56D 10488 bytes
SHA-256: abb5b4bb2747a7238e035b0d2a2fde0caefb6cb11d180c6e977ff3215ef97a7b

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