Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2ce02f0c1acbeb…

MALICIOUS

PDF

77.2 KB Created: 2021-09-19 02:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: de8ececd2862acffd3f76b7f31c2fdf0 SHA-1: 86c6cb6c002943b9a3e98a1edd5250cf32f2ea36 SHA-256: 7f2ce02f0c1acbeb25fb3d706f6877ffb6a09c079f01f8df45676d23ac7a509a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms points to a tactic of using indirect links to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://usarsenal.it/userfiles/files/zafam.pdf In PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/fowujatep.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139ae283dfa4---70198637814.pdfIn PDF document text
    • http://hrudolf.com/userfiles/bibesotazeg.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/lobemijojelopikajesuzalim.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/34610598198.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/71256770189.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/bibosijasejuvupivaxosida.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143c394390bf---18659445043.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/sajajotasewojelobinup.pdfIn PDF document text
    • http://bubb.cn/up_file/file/62190895503.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/82216102522.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a80e084b6---davoruranerabu.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/wejumekulef.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/44356dcaca895d780f523b0e1bc2e832/61962272553.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/1b68257ebd3ea7568907d99d57f54456/dupubawumatanifoxotifokeb.pdfIn PDF document text
    • https://majubesar.net/contents/files/ratodebapowodekitanuriwal.pdfIn PDF document text
    • https://banghenails.com/upload/file/nirak.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/31773202783.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/kuvozelulemazisuborilip.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/puvuxejar.pdfIn PDF document text
    • http://xibuhuanyu.com/filespath/files/20210903095637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=vlog+editor+mod+apkPDF 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_off0000c9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F9 17724 bytes
SHA-256: a0692d80faf027910b0da34b3010f77bba65cc1f1d956dca7f8e4d1d10941b0f
font_01_sfnt_off0000f809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11020 10524 bytes
SHA-256: 7ec993f2904c850450c256c67d1f0611371d368833d0c37f6296f3f707a97950

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