Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c3441ae6c131d1…

MALICIOUS

PDF

86.8 KB Created: 2021-07-09 00:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 283b62007abf33a5cb2ea567de3b776e SHA-1: c45dc4a8557e34ffdccc8e7214d3c4f304cec96d SHA-256: 37c3441ae6c131d1f25bae2f85f5ec9059153fe33caedac27c5ecd4e2b278b94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The presence of link farms on disposable hosting and compromised CMS uploads indicates a deliberate effort to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://archism.ru/uplcv?utm_term=i+only+have+one+wish
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c90f175ebb---82442914584.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f52d5de44b---24278564063.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/d803c49d73aba27a736b50136fcf3791/luwomapubawilemil.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/sirkh1n75u8dppm9k198ocmkth/43583150917.pdf
    • http://marsalanoleggio.it/userfiles/files/defiwapikefaluw.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c63d7951606---kepiwilobobatasujaxu.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1953671c68be1fe063619c3c7da068d2/wajeji.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/dfaaf0906d6259cc26259db7a67b4571/beridome.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/a1ab11a95894094ff6f949a6089409c6/7806888197.pdf
    • https://zaragozadenoche.es/upload/files/viliwusoretajivil.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087ca6f630c2---98610314991.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c23cb4c8d2---dofupupatazolifagebugolo.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160765079ac1a0---koxuvowa.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086b8f7897bf---fakarikewetozex.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7559d1cb10---gipibigabodevolag.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/mn94266fkkn1rskiiqibkm26do/widagowuxefejimeleledaku.pdf
    • http://simonide.org/userfiles/file/tufixepowafamixodafufari.pdf
    • http://www.toptehnik.si/images/xilonijipumokadeti.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58db7013ee---50308635974.pdf
    • http://ubest.ru/images/file/bafejurixejapupeleviv.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4f20a8328---zunipazexajukalubag.pdf
    • http://biomisszio.hu/tmp/zenexamifurafuzebonud.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7aa8abaf0---sodogomelif.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/664045f374b0070b8552b11c1ade22a3/4537777946.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/370208a4bfd09d3771de051f43f81497/81711080259.pdf
    • http://kamennykoberec.eu/editor_uploads/system/files/90987208417.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/92451454120.pdf
    • 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_off0000f1d6.bin
b0df71bd47236ae160f3c855868b2d2fca7807c5f92cd18808e6ed4bb8ad87f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 17340 bytes
font_01_sfnt_off00011f11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F11 16792 bytes
font_02_sfnt_off00013728.bin
eb46d1a95e8e66bedf579b89d2ec4c02890166f8f5fbee2814eaaa001a8bf7d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13728 10224 bytes

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