Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1bc44bc7b68a54…

MALICIOUS

PDF

104.1 KB Created: 2021-09-06 18:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8e792c8b25da67ce132dc5550ec5080f SHA-1: 87e80920edeb2fd3dcb8df35a9a0a3731fa39b5f SHA-256: ac1bc44bc7b68a546f6489c6c63e11b36a21072d2c164159302ee0f8354ca9a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://medvor.ru/uplcv?utm_term=training+needs+analysis+journal+pdf PDF link annotation
    • http://wang023spa.com/userfiles/202108file/2021082915085770554.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/janubag.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c79fe7537---baxawumegubufiwonu.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160755da658bc0---nuziwufa.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/bovotezapu.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852805d7b5a---miser.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/karotenok.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607907900b990---78201550440.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/pusad.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/k99cdl451ekifl5usj71fa2b2v/tebefupakoxute.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/23304906186.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56db4ebe39---xapejuzifefanete.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/vinagaxemamamawizililivex.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/likujab.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/13111262697.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070538eb31e0---judili.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/fpea4r6ah90qg57ukqvbt7o4vh/88933178038.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/tazonakonipabutogizu.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021051811172284.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2aabe9d1df205756066b290c8ecd7830/jigofudegezik.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA7 19420 bytes
SHA-256: 917c968daea5577c798d0df70e10307938b044b38fa84dbfb18cd13b7aac435c
font_01_sfnt_off0001617f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1617F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17996 10884 bytes
SHA-256: b847ed2fef0c3648b764240da0374d2b3ae6455058457e280e81432867f20c7d