Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa07f82c9a56e658…

MALICIOUS

PDF

89.3 KB Created: 2021-09-01 17:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 05c15a9e4a0aa0cd8a0cf3229ac167a5 SHA-1: 87bcbc71dd267e2ce41cc7926e7780623dbd24eb SHA-256: fa07f82c9a56e658f825c41561659ca936d147d9e4f88e29c3db5020e1c5c12d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing sites or download further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs indicate a coordinated effort for SEO poisoning or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b60b7382e86---43038438347.pdf In PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e54e5004c64---lizilofapoferib.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/bafuramivibaju.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/47864582221.pdfIn PDF document text
    • http://vaynhe.com/upload/files/borefovadusakekazigereba.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021060104452155.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1a9584679---xogafatanidu.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/a040457096338bdf09eb10c04a5a3a6a/59062065644.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/45262554561.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/58572291058.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/96383445825.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/bf3974187bd576fcb3d688110da3a303/sasagek.pdfIn PDF document text
    • https://33mobility.net/uploads/files/kufaguzetibugidadulugibog.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/nabemidinawak.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6afe5be5be---63098287914.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085106463714---37199947963.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/jezaxu.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/e1161c2113bd62afb0b1e1ab86cd07b3/kumegudaraxidigo.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/57976589441.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612074dd560b5---25227082310.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021083121092486993.pdfIn PDF document text
    • http://artside.org/data/temp/file/korijuzegulafapog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+martian+by+andy+weir+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_off0000f7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CB 10732 bytes
SHA-256: 61cab474ad20164d0e1f518ca600299e48ab32e5cac65e2aabdd92c4c5d64db8
font_01_sfnt_off00011011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12823 18240 bytes
SHA-256: 3ae3cf22d336c2b108172511531fc21ece84664796f142a1c0a41f5ffda49bd5

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