Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d61d469672c6096…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 19:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ec989bddc6293700061b74d9e963d46 SHA-1: 21468862770f07f115609f12f698b5b3bf7aa685 SHA-256: 8d61d469672c6096a2fa6e9e49c150bd9558208fc445a4c7e6d6ad0c4a131c90
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDFs hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/7fd1cd5461dff0687324ca4494b49f2d/88197173444.pdf In PDF document text
    • https://idealist.ro/userfiles/file/94127859962.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/94075026626.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/92409e09169005a8e07abc347f18a054/jijigixulokixopodemevel.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/mikosokanudikaxav.pdfIn PDF document text
    • http://chinazzjx.com/d/files/bavademevaxeg.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/1ba342c263382e6e9a1986c95025c33b/xidetirorofoxavatojod.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/73851553048.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/juziwiwevazibuzawika.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/ripojimuzovesu.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/75279517560.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/13831732131.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/52754607117.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/71071471565.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132d7009acae---94780307029.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/49838735405.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/14262624629.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/semojibekijonuliw.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/nonufiviberetuzuz.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/28402601609.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/76210424736.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210911_EB73B2491D0A3947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=coc+new+th+14PDF 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_off0000d5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F3 10008 bytes
SHA-256: c146321df29ac235525ce4a4f5a4d365f9f176a205204218d8605ebb8f338d9c
font_01_sfnt_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001044d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044D 17868 bytes
SHA-256: dd8e7867977b7910323a692d8f0ff5fea54c7f9630918cceab936b25064d3745