Malicious PDF — malware analysis report

Static analysis result for SHA-256 f012167cb6ace06b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 16:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b2900679c587c99fcdb4d25edd79d924 SHA-1: 3b59f9cf61573a6f6eb6679b4cc1716b533f77b0 SHA-256: f012167cb6ace06b0107024ef5e001de156b3df920ea08cb5b78e9db2227d581
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, specifically targeting WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/9k6d6j5dcgcqeaqbk2g990uno6/runilun.pdf In PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/81701922013.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/powoz.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c8518814bd8---sezafilaxezo.pdfIn PDF document text
    • https://merydian.pl/nowymerydian/userfiles/file/reribemeza.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081804ecd337---bupiwekupibarunopafeba.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a8498098836---19817972384.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/tejarisopef.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/tedevujijusalo.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/vovamafalesemerozul.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f82bdbcd20d---xiriworuwafazepafu.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/76222293900.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/tinefuvojib.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/67480589778.pdfIn PDF document text
    • http://setadijital.com/img/userfiles/files/fixabilusow.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/34d9e26ac36578697250a44e8a949805/tuxuwuriviwip.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/abgd0ear123b3fpkf5r2mhvd83/53278331442.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/72696769317.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/qf5ck66v32dgieu8j1ug0q2mj5/bogofavefozux.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071e115cc565---bibonafavekagetewimun.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/ukp7ihup3v41p9avdb70mh8i3c/suvoxelixiribakelu.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/74895498677.pdfIn PDF document text
    • https://htchninc.com/d/files/jewitapakaxigaded.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/xasenufugaxenozilikugawak.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/favivevoladikekosu.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/gcgs6u0pcgq3da411jg1i1dcv1/65363506703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=online+conversion+of+word+document+into+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_off0000df04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF04 10896 bytes
SHA-256: a62df0c2c45180256483c9cbecb18e4484174cdc13dcdecb66d4e581996514d5
font_01_sfnt_off0000f853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF853 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11065 17256 bytes
SHA-256: 3ca1685998940240da17a7e623f4891a629a0f2307aa3bfa5dc4b2b976742604