Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b057ddbb2cbedc…

MALICIOUS

PDF

81.3 KB Created: 2021-06-26 05:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 507c89fa5a1ec0bfd2ac1964e3010d02 SHA-1: a58961b640b1cf5781efe30a97d6a91bf5d214d6 SHA-256: a2b057ddbb2cbedc797c92c85c48498b8a3e6582a7ade42461d5fe7b89f272e1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://safrano.pl/userfiles/file/91594940161.pdf
    • http://dambi.pl/userfiles/file/28645274788.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d345d3f26d---11573071820.pdf
    • http://dichvugiayphep.biz/upload/ck/files/82173462958.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c58469be7a---rinazakopuxirapidipibisa.pdf
    • https://eobliecky.sk/userfiles/file/sorodivovi.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc6ffbc45c---98329322637.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609a96e98216c---vewukofesaxuvigaka.pdf
    • http://connect-senior.ch/uploades/userfiles/file/zijojutozad.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aea7b1a246---15226171339.pdf
    • https://pacpartner.net/images_client//imagesfile/malurodivajadusojo.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087004ad1ad7---341565122.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160affc49cd008---jagajozetirazagusunisagi.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160805dce1fd6b---51458270811.pdf
    • http://wallsfamilyreunion.com/clients/876683/File/99861924134.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/ed00ccad27b488d19172ca4d1132e5c6/fijajajaromiw.pdf
    • https://atlastoursntravels.com/userfiles/file/38212435580.pdf
    • https://planet-for-events.de/userfiles/file/91812703047.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074fcaa08291---42268863741.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/45f2c5ee91ba61a8f8cd40ebd38c6fdd/ruguk.pdf
    • https://vokalensemble-vocembalo.ch/userfiles/file/kanowesabox.pdf
    • http://cnmrobotics.com/files/files/kemedokipeliwen.pdf
    • http://nt-module.ru/ckfinder/userfiles/files/vuduzenesi.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080863c54e03---wogujufulu.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d7e3707f8a481ca8c3f5d37c3f99d004/45136592408.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/9a07f28cef34d66ad13d72c368048198/32332651486.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+oxford+handbook+of+human+motivation
    • 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_off0000d939.bin
5bcd686084dfa12b6407cc5d089065e3c2b25647e97b4a3a467456feec7a515e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD939 17408 bytes
font_01_sfnt_off000106a4.bin
b53921ebb3cc2e41be00827a964182138ae64b4a79ecc8126cda84f313e6fdbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x106A4 10868 bytes
font_02_sfnt_off00011fa0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA0 16792 bytes