Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d2b6b5073e2737…

MALICIOUS

PDF

69.9 KB Created: 2021-09-18 07:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7fbb21a4bd0e84a0b8b6366d42c7da2c SHA-1: b13047b1e01ce9204d9df5f845b0edde771891e9 SHA-256: 45d2b6b5073e2737d1c74308d507650c17fc497bae1eab6e822aa8f0424045a9
156 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, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing or a trojan. While no scripts were directly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://woodbridgeabw.com/uploads/files/17306866820.pdf In PDF document text
    • http://compsult.net/userfiles/file/ramitawo.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/watavazamijit.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142eb258b6f8---mawaridu.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/soruzujewap.pdfIn PDF document text
    • https://stauber.lt/images/files/mirozab.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/94c19392546993e84a539488de9e6256/8127393122.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/befibarufinerasikedi.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/pipupuvukonatati.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/98541983695.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/35375977386.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/fujusinetad.pdfIn PDF document text
    • http://klinok-saintp.ru/files/17260883231.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/6039405609.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/suwana.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/nujure.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/64598167500.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/7f1a442ae983f541b53835543c842a17/30613599132.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/6386604190.pdfIn PDF document text
    • https://maria-galland.ru/files/file/ripozela.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/79240897920.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/99906877847.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/fafunegozipukexozete.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/54112873158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=genki+1+and+2+pdfPDF 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_off0000b07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07F 16544 bytes
SHA-256: da7e88117bb976c95922d1715951437c664d04edadef2dc797ea2601952ee6d9
font_01_sfnt_off0000db46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 10260 bytes
SHA-256: 2416f4ef670c6aa288510698b1d10439523dfd93c67388f96d989fc989af4ce5