Malicious PDF — malware analysis report

Static analysis result for SHA-256 175859045dca20b4…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 07:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4ae4c1815d9674d3c5b250ae02cdceed SHA-1: d9bf80ada5a33f764983c1ca9d5575836fb6afeb SHA-256: 175859045dca20b464e571963a824dc8ddbe76e24c744b754f3d5b40563b9f79
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://onestep-tokyo.com/userfiles/file/6038958068.pdf In PDF document text
    • http://maybaobidinhdinh.com/upload/files/32938279897.pdfIn PDF document text
    • http://info56.ru/userfiles/file/kagaxamilawovasevetol.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/tuwibajukegekirosusol.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/rinifadadax.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/57050326237.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090120482840.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16135bc172b73c---torojagelaliw.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1614181aa899f6---vuzupazafudel.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/42144426195.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/gotokelinizeraketejivabu.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/49219191156.pdfIn PDF document text
    • http://bakoca.hu/files/file/jegakuzowogokide.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/78dbc2589dc8cc163abcbe5d9fd3dc53/8021893460.pdfIn PDF document text
    • http://samtekelektrik.com/files/830223170.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/tusebejafukuxuvuli.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/44712747795.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161405ecf6a443---dimemugo.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/47822559933.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/tizuj.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/25900257492.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/wagijeranan.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/runakazamunawukomuxusop.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/fanoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=123+movierulz+online+movies+downloadPDF 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_off0000cf68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF68 10868 bytes
SHA-256: a676de08c21f12e08d2bdbc8ebc8d78a6f252db1e88edff538f4e82eda4ebbd0
font_01_sfnt_off0000e8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 17348 bytes
SHA-256: 39d8c7dd6d94332b4779281df155a1e8ae9144a7c0e792acc5c742437f939273