Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d8f75062e79bdc…

MALICIOUS

PDF

84.7 KB Created: 2021-07-05 12:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3258999467c497af195acef79f2b23fd SHA-1: 5d6f3b53adec8c999c834d7cc37d28e215a03dae SHA-256: a2d8f75062e79bdc7d7a9e5f1a7dac15da02c8d05f4a126be43d88797804ceb9
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. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress installations. These links likely serve to redirect users to malicious content or phishing sites, a common tactic for distributing malware or harvesting credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/ca915c7903f8ed9dec54003850457f4d/wuwototeri.pdf In PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070e1e6d0757---tetetezarukubegipenibomo.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b23c5de9e5---pesuzawazulagavutetor.pdfIn PDF document text
    • http://didula.com/img/file/78859576267.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607988a91b6e8---94107875088.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/1372582679.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/050e6cfd0b832df46975799a20696f35/43498198909.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/kunole.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/gafabilabikepopelu.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/cc5a97a9f021d513f23f14f543785e63/bamurifuredefazokap.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/vuxovefijesirekebil.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/39243855614.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/lomusatejepizej.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608711011a1a5---26520792500.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210701_DE77C15CCD8BFC14.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/9869887083.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/34673266032.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/2io65lk0omfmmn3fjos7v1h320/76480706796.pdfIn PDF document text
    • http://enerjipiyasalarizirvesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d68caad15fb---peregokimafolumosenepali.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/32212462179.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/c80j4pr0ngmprrj04abvvf9342/19548706534.pdfIn PDF document text
    • http://hongdacable.com/d/files/sadigidiz.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d1e85d3508d67468030bf548e3805c0f/bupoxakezosejorasas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+dred+scott+decision+stated+that+slavesPDF link annotation
    • 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_off0000ea86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 10496 bytes
SHA-256: 711877d1629550a92d1ea198e3f42ee6d552a920980c2e97bab8a0aeb204245c
font_01_sfnt_off00010260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A72 16656 bytes
SHA-256: cc42d7b77bf21d541c2331c39dede1dedc522d29d83a164523170f4d36eaeb57