Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ac88189167e720…

MALICIOUS

PDF

78.8 KB Created: 2021-09-07 00:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 82a678f73a1f5eca72fbd533e755d459 SHA-1: c0e4698a560f8fe17d8f13131f57fd2d23123f0d SHA-256: 71ac88189167e720b68fc88d1270b48b4dedb6e75e5d51b39f76bd194c11452b
196 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. The heuristics reveal a significant number of embedded links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of the embedded links and the PDF format itself often facilitate the execution of embedded JavaScript for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=dymo+labelwriter+4xl+user+manual PDF link annotation
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099214885d56---55510533767.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/95976061021.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607276833ff62---guwiliziretudopepun.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/88263524412.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109060746554027.pdfIn PDF document text
    • http://cy2hand.com/userfiles/fajezafutasarivigusu.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecfe6e4320---74793574902.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b49a1401797---xumuzadixipesonixaberino.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d343c8fe97---24121692122.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/mexuwabuwetekebobezudi.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/96137220667.pdfIn PDF document text
    • http://jngf.cn/files/file/jidoramifasebuxig.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/juvawazolajuziwafujo.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611f8281a812e---45307300181.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/9e167f3d757d861f80448a8b73223633/26383801698.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16128e4bc1d8b0---37386026619.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/dubezolonoxowepoguj.pdfIn PDF document text
    • https://vijyaiprismcrm.com/userfiles/files/motopatekowozade.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/waponijadonufibibex.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/sibezimubiniroturelixi.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611150a581cb7---ponotagolumijisubop.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ffacd9777---ribemanemoruruwoxu.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_off0000ce1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1C 17836 bytes
SHA-256: 5512fc06d297e7c06096de175263fc8992fb869bed971874e10df914c1c8510e
font_01_sfnt_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 10888 bytes
SHA-256: dd81950a1679d70b71b0b02749830c46115eb5affe0da06648ef257d862eaad7
font_02_sfnt_off000115e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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