Malicious PDF — malware analysis report

Static analysis result for SHA-256 49864463b4ed4458…

MALICIOUS

PDF

87.6 KB Created: 2021-08-13 21:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f1efb61352f3af6e02b36271e3f395e8 SHA-1: af051114a3140a7485b129e94c628c22bdb14b2c SHA-256: 49864463b4ed4458a56262121d74cbbd8492e3884d3446ed95af979b5fd672a3
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The document body is unreadable, but the presence of numerous links to potentially malicious domains suggests an attempt to redirect users for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bidwoodmachine.com/d/files/vuzaxivolikezeniz.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/k0v56htdc33njsafk42t8g5mr6/pabukodatasamexegu.pdf
    • http://reklama-kemerovo.ru/files/files/xiladulek.pdf
    • http://mashtalkandil.com/userfiles/file/35893960558.pdf
    • http://buchtel1967.com/clients/26382/File/14953280069.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093fd2f7bd66---4567624981.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcabb87654---24350938734.pdf
    • http://alarcon-v.com/editor_upload_image/file/zebapadofejimadulexugig.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cc6759503---pebuxevalanawotasajuxebof.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160879383e675a---videnokutasinulura.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35a65d55c8---2865033887.pdf
    • http://superpart.com/files/33216498080.pdf
    • http://w-mill.jp/images/file/74638921513.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/1fd0c4ff12ac80f0a3417d165d64591d/80026229416.pdf
    • https://mehreganimaging.com/images/upload/files/65848180226.pdf
    • http://vorne-sitzen.eu/pcms/content/file/59148934014.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/n4hohr968l7sq7vs6v74hnt8o5/tagutolonikal.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/if8n5fnq0h2eq497vc0ups3pq4/45047691655.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e25313e394---67143387454.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc7e0219d5---didatimikozux.pdf
    • http://hgbs.de/userfiles/file/rutikaxim.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2a91bd651ac9d4b0dbf8918a1f913c2/6970731419.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+does+es+espanol+mean
    • 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_off0000ed87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED87 16792 bytes
font_01_sfnt_off00010599.bin
4503c061ea53487bbb9f6a1e7c4ead9bee06eacce396c98830ae83d7836ea280
pdf-font-stream PDF embedded font (sfnt) at offset 0x10599 19992 bytes
font_02_sfnt_off00013868.bin
ff001f44a22edbd98cf74fe10ad5701d6cc90cc42d40e3b560964a55bdc23b83
pdf-font-stream PDF embedded font (sfnt) at offset 0x13868 10460 bytes