Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56ad37126cc7865…

MALICIOUS

PDF

88.5 KB Created: 2021-06-29 08:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f09ff5edff1cd8fac921551c386ed91a SHA-1: 739c3ca7debb203d562ad833d7ddc46074e68023 SHA-256: d56ad37126cc78655f9bf85474a45959771cfaf15141d32ef0259440bd564176
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The embedded URLs and the nature of the heuristics strongly suggest an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a360ea1f3ec---xomaxosomuxobenefirafasek.pdf
    • https://casabresciani.it/uploads/file/vizojuwig.pdf
    • https://alamansyria.com/userfiles/file/60708147488.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/15df31fd171b7d862a67983bae345c80/62888326048.pdf
    • https://bhsbeacon.com/FCKeditor/file/wopanivozexovibina.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62e066e17d---71607848597.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/85b819cea35b70be9947b95736374e14/52498781610.pdf
    • http://arniestribu.com/campannas/file/83735229644.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ea18b18ab492a7d6f2b9aee2100d2ad8/nozetanigafaxutilolebata.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf6eeac0bea5086ccf8d1b6b8ccba582/58491961090.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/drod11jhdrdmg6d3s52nclvun0/23499298397.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/1hs3ebm1e8b3s9iepoarph1val/51483127893.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/9ac4856a8668df6203fc45ae1b917f10/12586315447.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ec0ccda1f---54201323686.pdf
    • http://ore-processing.ru/d/files/manatesipi.pdf
    • http://turnyras.lt/Files/file/21786780091.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/30602d6ffb339146de0ba8b7ad5a4a84/90983806289.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16080487e26b13---mojizerisuw.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/4d8ab444f990759148a0b436bfdb7713/giparifokod.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/37be8f9f890d89687d433b47fc97cd17/20952158338.pdf
    • http://duda-tech.pl/dudatech/upload/file/83981551.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab812ddebc---jovedowevegoxijuzimitapag.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/2897a34c34ed7581498f9ce117273fca/69131473714.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3f071df38---67875196581.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=spanish+for+without
    • 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_off0000f48e.bin
1a28b5370d913f0deb75723386cdfafaa1b7c4cc9e7dc9a48c73198ce74c983d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 18672 bytes
font_01_sfnt_off000124ed.bin
4e6faf4282d2b9d19d94f3abf0f0677109eefc5b0e555942c33b78a6b637d89c
pdf-font-stream PDF embedded font (sfnt) at offset 0x124ED 10536 bytes
font_02_sfnt_off00013ced.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CED 16792 bytes