Malicious PDF — malware analysis report

Static analysis result for SHA-256 574aa12e6fa88571…

MALICIOUS

PDF

80.7 KB Created: 2021-07-01 13:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e885d74d471ad001b34972612cf4e3c SHA-1: e5202f78dd097135d39c05dc386491fae77270a5 SHA-256: 574aa12e6fa885710e254796c122f2bd75ad1c409dd565abae8bf972f1505e49
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress installations, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and does not provide clear instructions, but the presence of a link farm on compromised CMS uploads is a strong indicator of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/437411a1a59d23aedc3230c337c9ab4d/kabivudotomivozupevij.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/c835cf4d14d6911dccbd0f68a5c3957b/tomelaxopudixovaxapuzil.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f15a911ee---36050291011.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083b67b3c7bf---21455465131.pdf
    • https://heatingboiler.ca/fck_upload/file/nebowuminafupuf.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852ce5db9b9---50364730264.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f08edefab8---kikinorogur.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-16/20210516074620165097.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807ead90e1f---wusavigetogorubevipaz.pdf
    • http://smart-ventures.ch/upload/Editor_Images/files/12691021515.pdf
    • https://ludifrance.fr/userfiles/file/tuminekiserunuforenofeze.pdf
    • http://scamps.biz/userfiles/file/ravuxuduwamesitugi.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/1ftnn9r3oaulanfst58i5c80tv/kisubulebobutuwul.pdf
    • http://wib24-admin.de/uploads/file/33447127543.pdf
    • https://maxflowfans.com/userfiles/file/gosav.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8393b2b89e---68357766322.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160791d11bd23a---61036765088.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/e7446c25b479661ba1bedbddf60c8c57/jomigutur.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ad90045da---16524681079.pdf
    • http://vitaminyplus.eu/files/file/najup.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/pnr3k23mth03imtern1v4hbjdm/1608015158.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608326fe41de4---zokawuba.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607622ba6e5fa---fazudikobufimebebumevej.pdf
    • http://animalscipublisher.com/files/upfiles/file/56513768645.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8b3ec7298---97966302813.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/acra2dcsrft36r4rv0m9jp63cl/dunutuvavul.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=food+web+with+diagram
    • 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_off0000d9d0.bin
b05855225c6a49c8bf7f43ca6a6be5d94cddc9fde239c1f14b79e62ff241971a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D0 10580 bytes
font_01_sfnt_off0000f1c4.bin
18508ca4f1c271fb24c2cfeb0b28598e7af01a91a7c5b7c5959345de890b02ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C4 16780 bytes
font_02_sfnt_off00011d83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D83 16792 bytes

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