Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78f3c9c5124bba0…

MALICIOUS

PDF

85.8 KB Created: 2021-09-08 00:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6ab57070c0c7f8f9649b0a6e6123dbff SHA-1: 9289e6bad59272981a9daee838969bb31b27928e SHA-256: c78f3c9c5124bba04bb91c0c36b0869d9caa1c9e0ed748e1556de99ab97bef96
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, including one pointing to a raw IP address, suggesting it's part of a link farm designed to redirect users to potentially harmful content. The presence of multiple compromised CMS upload links further supports this, indicating a tactic to host malicious files on seemingly legitimate but compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1d52e0ba0---tininorikotokugelimag.pdf In PDF document text
    • http://rencontres-icare.org/userfiles/file/33280624103.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094138357450---rofod.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add2ca544d5---86467887559.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/38882612940.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/kuwozopinakup.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/mucfp6jbue1mvkgpjd54krn9oa/69017181094.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d60d6410df---56664452810.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/zavise.pdfPDF link annotation
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/t35ro29gmqmj2or0kbilkollci/venobakigalaludiga.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/bewozopamedolanafer.pdfIn PDF document text
    • http://renovator.cz/files/file/kimisalegukuzan.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/ee4394fc993932815e823a0dbb6ede38/filukokuz.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads//files/202108071912221379.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/19012936940.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9f1c4192b366f37b36f5d78b6387d22/tolubekizared.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210722015435122.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/kesored.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/6vl52iptqpbv81qlnpcg1dpgj8/xibisewunivurakivologen.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/j5g0fbn3ev8vvbhjmjkl1vo81c/50195135247.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210702_C93C0819EABE403C.pdfIn PDF document text
    • http://innotack.com/userfiles/files/78101055426.pdfIn PDF document text
    • http://dfanchem.com/upload/files/guxemavenupifofika.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b4dd8f7376a---42943418709.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/nururonokuroza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=deeper+life+bible+church+hymn+book+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_off0000dc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC51 22748 bytes
SHA-256: 303b0af39e244233c1032baa5016db92b6dda5e911709a06d001e0df263be2d1
font_01_sfnt_off0001185e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13075 10904 bytes
SHA-256: 7bd0ed8389c7c69637245694347fba242dc8451c428d50f15a2be95c8d2fe671

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