Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c8adf62ac5dbc1…

MALICIOUS

PDF

68.8 KB Created: 2021-06-25 12:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56202a4cbceec8fe1dae703e982883b7 SHA-1: 87388c1a913f22bf5b6e25eca59f9c48c8cfd706 SHA-256: 24c8adf62ac5dbc19bc4ffb16ca96ceb79e96caafb90c0c67a8e52af286fbd78
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, acting as a link farm to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f063977cb---4678094849.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78137309a8---kipojusa.pdf
    • http://ampletrekking.com/userfiles/file/74025420543.pdf
    • http://dioceseofniranam.org/userfiles/file/73975130237.pdf
    • https://jahanchart.ir/data/files/file/kivuburavoridovevotutegis.pdf
    • https://unosms.us/userfiles/file/vevogopusufofazugexa.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/2qdmuk0ar2aqikr227c829vg1t/82972703222.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607920037760c---mafopu.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/gukuxajazavakimomame.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d8e2d2ac---77645651780.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f483a4c370---28888927231.pdf
    • http://tourister.kr/userfiles/file/xezolozeditoba.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/bo1pq4gbrv0opa9v2eg1uahgo1/77110391782.pdf
    • http://muszempilla.com/files/file/fizedekanugusoroguniba.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f85351bd19---tajizikigovufu.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c990c825d67---37194040916.pdf
    • https://aslimitada.com/userfiles/file/17321517706.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=telaire+7001+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afa2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA2 16792 bytes
font_01_sfnt_off0000c7b4.bin
54f7d119fca36e1d874c33dcc731530c2445a47b84c755fe695519adbffc3886		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B4 15588 bytes
font_02_sfnt_off0000f004.bin
e1e747708acd9738bbad46ddae3ae1634ff70d544e950fb033301e0b212dc9ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 10172 bytes

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