Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae99088ae3bda3ac…

MALICIOUS

PDF

85.1 KB Created: 2021-09-21 06:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d787753e5973566a3f73f54b7bd2ff75 SHA-1: 1029b433d759b4dc25cc3f8f0e2c4c9077cb8f9b SHA-256: ae99088ae3bda3acb8ecab2a4f72f162f681ebeb77c738046f423f4d7a81e3da
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised or disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://censcakmu.org/board/file/files/499887627.pdf In PDF document text
    • http://dui-antidote.net/images/userfiles/file/1630165246.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/viwepan.pdfIn PDF document text
    • https://bursac.net/userfiles/file/xevukotonakebonu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161409a217ccf9---33070675825.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/zesuvobavonibedewofutasev.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/3af7b9bc90e41d65607f4b117e2ae011/52055379692.pdfIn PDF document text
    • https://webaprint.be/img/file/kivatoxuz.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/18589029325.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/62905255247.pdfIn PDF document text
    • https://basisnomor.com/contents/files/32014591654.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/2721193327.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/wixijofe.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/17189851828.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/e0e874e0a8fb3b8f72906a38a66b89fc/vedines.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/gulis.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/71209080922.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/penogojexumuve.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/ropasilusulumul.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/garasagusim.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/besimorameb.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/14511633504.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/xaboxibujetitotuba.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/81583644675.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/sunedemikaxavezekekomevud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=6+underground+torrentPDF 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_off0000e2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE4 10124 bytes
SHA-256: c9fbf6ab5d08c5ff2ccfbc61211414aa08beec960632525a824fe4f8820688e1
font_02_sfnt_off00011166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11166 19776 bytes
SHA-256: cd703d0f33ee8db9f999ee920ce18eafa66af4dc0c676b4cb2ee12d039dbf549

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