Malicious PDF — malware analysis report

Static analysis result for SHA-256 8621a4698d1af215…

MALICIOUS

PDF

97.6 KB Created: 2021-07-03 14:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9f8847f3f5ed20cc1a2e12ee16e3b906 SHA-1: c8c77124306f80f2a0a54f5f2911f476564a0d42 SHA-256: 8621a4698d1af21514912a015694c827453bf7ccccc2a3939c21e78ae717b730
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of a 'train simulator 2020 download android' URL in the feedproxy link suggests a potential lure for users searching for software, which is then redirected through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://www.findvoters.com/userfiles/file/xijizemifolorexekar.pdf In PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/nanapawopufegepon.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0cb0c9174---22366934070.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/kixejepodotomanomopo.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5516bffcb---42860194318.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec47415068---79794841153.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a15101b297e6716c25455c0fc42eff8d/zaporexusaf.pdfIn PDF document text
    • https://wittnebel.dk/file/mukerijaxore.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/latulojotesolaj.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/73521182976.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/f00a18b54906aa60a36e5c2f432c784d/49351256432.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b1a91169b---kajejunigerefiboxu.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/r98ngms7i0i8mpir9dlsf2rc0n/56622869672.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/tujataxe.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/40153764462.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/44760709928.pdfIn PDF document text
    • http://masonlegacy.org/clients/61515/File/bifetusiguxomofaluful.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/301e955ce8a04a60e06bb1b9535cedf6/lesure.pdfIn PDF document text
    • http://vodnik48.ru/content/file/81203710369.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/8bfcd5d52e798db2fda4c55d13c213d2/pufogawuxafuvubifuwizaka.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/94927812797.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16073bd3d9f597---3801241165.pdfIn PDF document text
    • http://17njl.com/userfiles/files/65247300250.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/64d9f606cc762270495bbc4733d4360e/3081451537.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/xesifadoduwajupufipamuwuk.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/dc92641c0b846910c9f1a9864deab56c/75373298239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=train+simulator+2020+download+androidPDF 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_off00011822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11822 18560 bytes
SHA-256: f04438691841b954de733c59226143bb0bda4b434513e5c01052d2eca789ec0c
font_01_sfnt_off0001484f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1484F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16066 10668 bytes
SHA-256: 58d894dc2d15aa1f6835a2e0bb69cf259860e96cc6fe78541d9cfa01fc6ed09c