Malicious PDF — malware analysis report

Static analysis result for SHA-256 f825ff141da06ebc…

MALICIOUS

PDF

92.5 KB Created: 2021-06-26 23:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c46c714d518e8f4f5d9ea4f97b2bdad SHA-1: d11c5b98da557857fbfe9acae95a18bf59ff0ed0 SHA-256: f825ff141da06ebc47fcb43d00ce279b111a78ba64d6e0b367e018e13190b1e0
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress upload directories and disposable domains. This suggests the document is designed to redirect users to malicious sites, likely for phishing or to deliver a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://syntellect.ru/Repository/file/542504142.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c766956250---fosariko.pdf
    • http://frezerovka.by/images/fxeditor/file/vegonerexematujulatovusi.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089bd8bbc87b---23791763540.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/41077358019.pdf
    • http://taketty.xyz/js/ckfinder/userfiles/files/64819405293.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/b3ee5iciaat7rj6qk7fvfr5p2t/98994692616.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/dpmvfcmu6s7tt93mqrla16dcp1/60264199859.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cda4c1dc48b---53349808415.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/vkvovm7heqlkb2u1ubvre9gped/denuwemugerejixabokazit.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/56924264d8dc51c96593ab7ee563eb72/31734303613.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb537af1c7---sukirazuguranuramipiwo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3bd70ccea---ribajekabufoguxelib.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/3d9e6f46d9010af35b5877065801e52c/1496992398.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/xuninilufubilunimuzu.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb894bdcb78---63302711185.pdf
    • http://novussiteyonetimi.com/uploads/file/36406250121.pdf
    • https://maturana.cl/upload/file/larixodiva.pdf
    • http://all-pass.com/folder/editor/file/serupajugatutepowap.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/rjors5e9h1au503n1572h6ie0s/10476861829.pdf
    • http://aarogyamedico.com/userfiles/file/67514493004.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2436396b56---dowufolapelinarepumixilaz.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/6c7ded804ecc1b7fa0772c839d545bdb/47213630225.pdf
    • http://yuha.be/_files/file/dojipekavujefamuduwudilar.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/9003674e259694069aba756a8c9699d6/92089149402.pdf
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/dusupi.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/85cde45525d8324fa5b11b8d7649f4b5/83519462468.pdf
    • http://skupka54.ru/upload/m/64814630887.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+create+sand+in+doodle+god
    • 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_off00010375.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10375 16792 bytes
font_01_sfnt_off00011b8c.bin
35cd7ce0b01fabd5c6227be3a9cc18b31682ee06c061f0fb8dca7b2055c4fa8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8C 10624 bytes
font_02_sfnt_off000133c0.bin
54dbe2b265a2f290c112268dde7d53aeac24ab6bd8e3614f68c0c27148b9baea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133C0 18556 bytes

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