Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8fcd24b1db20a0b…

MALICIOUS

PDF

90.6 KB Created: 2021-07-10 13:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b1801fc58975ca8494a480cdecb54df SHA-1: 0026c6ff6c0a493498b4e28b8f79c7ddc1470b06 SHA-256: a8fcd24b1db20a0b5629ca01386688f86f7c4e826e9ff1b79caf4aab31317319
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites, suggesting an attempt to lure users to malicious content. The file's structure and the nature of the linked URLs indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/4caaf1e23779ac40c58148a415265dd1/gijuxokureromaj.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16080276a5a5d7---nivoronitanivonudowupiko.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f428b5e6e8---miwisatabano.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ba6794137ee---gabuxopa.pdf
    • https://oxi-dental.ro/imagini_ws/60721351536.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070062ce857d---59137095252.pdf
    • http://masan315.net/board/imagefile/file/kejosebemifuzi.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a7195b2bb---titusawejukowurusireji.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7677c01ee1---19999256343.pdf
    • http://beveragesgs.com/userfiles/file/vobudigizuvabus.pdf
    • http://songiadabinhphuoc.com/upload/ck/files/gobironaposaxazasazegiza.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ac40d24ca---97128147313.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/330dcc3f807657a972d56a565856886b/jogaxelazorojit.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/8un9volspvpu7r9ptu2v45odk9/93911627238.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2c3c0c96c---70683538083.pdf
    • http://yoron.net/up/files/lizakinitivezakidu.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160872de991e88---23171230086.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1a13a7bd7---49894944647.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/jvjuago6l9qf594l2rsp366dcf516o45/xevakitopuxosiron.pdf
    • http://akinmedikal.com/uploads/file/90773817053.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609450ed4f4df---62285269459.pdf
    • http://altaprecision.com/userfiles/file/6798721634.pdf
    • http://krakow4you.pl/krakow/files/5278723879.pdf
    • https://unserbiokorb.ch/userfiles/file/3329980120.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=his+father+in+law
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010226.bin
dfac4dc9a34f531af1d7f4fcfab04e12397a5f95a0b5d2e24492d4c5cc8f0964
pdf-font-stream PDF embedded font (sfnt) at offset 0x10226 10268 bytes
font_01_sfnt_off00011923.bin
e61b4188f5dd0aeabedce4cd26a5801d49cd737026db17c84204ca248f5dfc3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11923 16932 bytes
font_02_sfnt_off00014549.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14549 16792 bytes