Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2169dc9587db2da…

MALICIOUS

PDF

92.6 KB Created: 2021-06-26 02:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57c595d86e9ebc6d45deaf599535c811 SHA-1: 08ed0342025a526b1d355779fccd2b5b19d99058 SHA-256: d2169dc9587db2da2ae29f1f14e7599a1ea5b076b75bd1833639bdc89bcde243
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs suggest an attempt to lure victims to external malicious resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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 http://iphysiology.ru/upload/derajusikekudorunagevun.pdf
    • http://coffee33.ru/archive/file/kufetutilatimopibese.pdf
    • http://greaterdeliveranceministries1.com/clients/61527/File/jomivikanifijajuzawu.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/0e04578060e8b0a3653f58e93949b266/nugova.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85392e474d---dowuzav.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/tfffv8hf2cftkvhar0hpnkph7a/10697982726.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/02b8355e0b8951f0c8276e9f61db8820/18914749104.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607648bfa2545---sumafeximotitivet.pdf
    • http://kwartetproforma.com/userfiles/file/dixumodovugesajojotapajo.pdf
    • https://anukulagrotech.com/userfiles/file/wutovo.pdf
    • http://artecgroupservices.com/imagenes/file/muzusejitedizofafupe.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609861cde567a---xepatopugapa.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb78dac3c5---97652744204.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa67d04291---36330700208.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/9f6a9lfaf672p1nkqp0g8c4bo1/76197796615.pdf
    • http://hzdsbg.com/uploadfile/1620876100.pdf
    • http://nordicaluminium.ru/userfiles/file/66524438641.pdf
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/ac5db558fe48ffff65c600164b086a16/sokovamotom.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16084756e9145f---35893795198.pdf
    • http://commune-bourre.com/userfiles/file/bujelukuxurokajewabepun.pdf
    • http://jjinline.org/file_upload/file/96176626087.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6368b1884---21716552701.pdf
    • https://gifarlcm.com/upfiles/editor/files/tawajaredutif.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/65c071de351d57a4b5e1b9e39176493e/sitem.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb152e5767---90198706100.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b12649a271b---majegokebepufewomozup.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=black+ops+4+classified+zombies+map
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE99 16792 bytes
font_01_sfnt_off000106ab.bin
5584c5d8797a2718ddec22530f4e08c4008fb4a4d6d3e9bb3d69776e129cb3f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x106AB 17952 bytes
font_02_sfnt_off0001361a.bin
4ecf033b29922958fbde758668d9473c235f4d51d28fd1ee0c5b33183066a853
pdf-font-stream PDF embedded font (sfnt) at offset 0x1361A 10904 bytes
font_03_sfnt_off00014f38.bin
619820be33a98ba79d3834fb79637885008ece67c8bbca44bf9e21fbd6698b2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F38 16172 bytes