Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3f05f30e4c0f2e…

MALICIOUS

PDF

135.2 KB Created: 2021-06-26 22:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 019923e916ff0b55ba367265c1863bca SHA-1: 05f15867577c5750c89c4acbc6821f82d6ed2e90 SHA-256: 8f3f05f30e4c0f2ea13984f4bd855bdf61bc8b09d5b6139bb89a6b6c896b64a3
156 Risk Score

Malware Insights

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

This PDF file 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 WordPress upload locations and other disposable hosting sites. The embedded URLs likely serve as lures for phishing attacks or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://inwebjor.ru/uplcv?utm_term=neighbours+end+game
    • http://markone-tools.com/upload/files/77225154166.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a5721fe1a98---86673968871.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/1320ed26bc6b3d022e9c1919444870d6/jisovam.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/gobipozi.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/5ee354fefd33e7b6eb259f4bd6db917d/wufuwusavipugiwodu.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/1af404cb4abf276faa3ec746bfbe590b/budoxivomasatiwibipobaw.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078b397ccdc8---wetukulowazukafa.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d29bda61e---45639169751.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160766164d3545---jogapibenal.pdf
    • https://tatsolarlight.com/uploads/files/bapofokuzunamin.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/8b5uvqal836183aq6du4qt3h82/30426570959.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/trh3688kmdjluk7ds6vh9k3ps9/18144534592.pdf
    • https://agrilaui.com/userfiles/file/65839081875.pdf
    • http://tweddlefoto.com/files_contenidos/upload/files/rawitemogasesotovuwaw.pdf
    • https://mecaniquekd.ca/upload/file/lasagemaxalobug.pdf
    • http://alpha-cp.com/userfiles/file/4461651292.pdf
    • https://sonarmusic.hu/up_image/file/vajifa.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7f43b29d9---31624431408.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/c9687d6801fb4ea32914339d29c30f4c/firivafeni.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160968fb481f3d---77099765373.pdf
    • https://migger.dk/userimages/file/zejobotimur.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/j7ai2d5ur47tjtuv7gtekv7vd9/34818242109.pdf
    • 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_off0001ad66.bin
801a2f388cf108928ffe7c00d71f77b06920a068dbde9f8c4075e428fd7b3b76
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD66 18664 bytes
font_01_sfnt_off0001deed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEED 16792 bytes
font_02_sfnt_off0001f704.bin
5249e45937cc99b2c44515b93472326ed0d1f78149bcaafc80d8ea71599d9f69
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F704 10768 bytes