Malicious PDF — malware analysis report

Static analysis result for SHA-256 adfd9857f15fcd70…

MALICIOUS

PDF

74.0 KB Created: 2021-09-23 23:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 26d1a29ca96ecfb5ff28b55c6eeb6ff0 SHA-1: a1cbf1e16548bf14fbf2641ca46a8bcba4bfa1cc SHA-256: adfd9857f15fcd70993765b5a555d1ade9d61f5af6ef1ac7187eb56b89223bd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely to distribute further malicious content or phish for information. The PDF structure itself contains embedded links that are part of this deceptive scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161464516d7854---31571865376.pdf In PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/23625262593.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/8356766309.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/27157108910.pdfIn PDF document text
    • http://pi-consulting.ch/download/59876419294.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/78890198002.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/97166289637.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/51481346855.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/bedepizopapemekobow.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/zopesoti.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/2eidvpcr4q8oa1putk7nol7gop/mojuwore.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/88830558892.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/49173228624.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/maxupufowet.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/98310172118.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/puvesawafufebuxadopa.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/sizovonurusoro.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/26507981123.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109150336441082.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd98464a53---tefogofezawovefupajova.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/49742768576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=yiyo+fun+video+chatPDF 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_off0000bb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7D 18384 bytes
SHA-256: e7a44f25b7b436398f0d240bb4648c233ffd9c52e95aae075e6e46d1b4a05ce5
font_01_sfnt_off0000eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 10524 bytes
SHA-256: b801821ed779f9eff3f69a4fc522678abf49ef7adfc01e42345cd47778a9b9b7
font_02_sfnt_off0001031f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1