Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0dff8b9b0b9c8f…

MALICIOUS

PDF

97.5 KB Created: 2021-09-07 04:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1f37ce90ebf4e3778c749fbe643fe119 SHA-1: dd7353886e73541a230e7dff29c97c6d23a42dd1 SHA-256: cf0dff8b9b0b9c8f94b76d826adb2be810c896128ed0d5020d5c5ee471dd790c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of embedded URIs and the nature of the heuristics point towards the document acting as a lure to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://cablexconsulting.com/Upload/file/legewixikumu.pdf In PDF document text
    • https://georeno.ca/userfiles/files/kipeperitasofosif.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/96580238315.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160932990611dd---wibavuvifekafeguseparek.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8b2cde389---22636859282.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/renezasirasolibezuzodej.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/3139f691b8db3eb70ad5f8233c030bc7/45744419531.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/m64ggmk4325q66ngcndfg4tip1/14155515485.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/27083019702.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb99d4a34---xalaludek.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/r5nalcc8ph615vgitm9ucvgaq1/kekazibemivuzadilezegejis.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/85504458630.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210714_07F30D5DC2E12171.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad566f537ec---80966411029.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/lu2hb67jg3ekepr0j5hg3lr0kb/nabapezavimizevewumuges.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b50496d7c12---61909756008.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1608247aaad8a3---viludokoze.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609481b28c7d5---86123623152.pdfPDF link annotation
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/8b1f2cc54f296ef7d42ef4e0b6616d11/tomagebawukom.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/budopezonerusozorerukeja.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e483ecea38---nubeso.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/sozus.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800251c2f2b---totexonif.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/lutimefosodulinefurisala.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2d1f98951---22076122476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+entropic+brain+a+theory+of+conscious+states+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_off00011425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C37 19208 bytes
SHA-256: 90391c6de5f5e779f7d3f1d64749a322191749619a6cc7a3f8b4bf56b9530727
font_02_sfnt_off00015e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E66 10988 bytes
SHA-256: a2ad90ccfb4c3be3831dbf3e9554175686a4e4f4b4bd16242d6efafaa9d0fee9

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