Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6a2df04b918934…

MALICIOUS

PDF

77.8 KB Created: 2021-09-24 13:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7b2d5ae4d64ea4c8f1677fd78ee9b9ab SHA-1: b7e2bf012083b56350d3b3e9959ad7fe9fb23a35 SHA-256: 8a6a2df04b918934e530500e2949359373c32c37d35e4035c733a1963ddb216b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or malware delivery. The document body was unreadable, but the heuristics and URLs strongly indicate a malicious phishing or downloader attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=how+to+earn+robux+quickly PDF link annotation
    • http://doctour.hu/uploads/ckfinder/userfiles/files/70195847771.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/nolexo.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/kagiziwuzirijeduz.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/jubivelotope.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/babetuniwizezapelo.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/94485157554.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/6302689290.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614279f28de53---nizusizekawejune.pdfIn PDF document text
    • https://cecprint.com/images/file/nigebifumupabaxemugudeji.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/vadon.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/47802879922.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/33055419983.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/jedafozimidi.pdfIn PDF document text
    • http://northcity.rs/slike/files/bowawolixi.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/riliriroworam.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413c83e7d7f---58444916753.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210924142327.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/bimatusekilujome.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/tumijofugutaxob.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/wanoj.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/fegusuxamuwopulin.pdfIn PDF document text
    • https://la-klamm.org/Files/files/falokupik.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/xuzukufixanopanakudidun.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/77f2f45c5b084942c8691835dc777457/80825373933.pdfIn PDF document text
    • 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_off0000c5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B8 19588 bytes
SHA-256: 237607bba113aaef4a85f197216ff27748c84a5f874b74ada83d061cb4bb1e24
font_01_sfnt_off0000f89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B4 10824 bytes
SHA-256: 12c306d094bffa1fbc2546015293db40dab45786007b36ecd950cb5a723ae59f

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