Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f324ebfd9a28688…

MALICIOUS

PDF

86.1 KB Created: 2021-07-05 05:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae251ac63248c3b62bff4592017c6c1a SHA-1: 1fe353a3c5595e591d1df8c8d1fda1e053f0c4ec SHA-256: 6f324ebfd9a2868851e7d81fbe05d0e202bd628ed468568e22222f8eda222775
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but likely serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609403b815f64---kukufole.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16077bea6a2cea---33140178960.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16078ed7b08a2d---87358635744.pdf
    • http://auapp.ch/userfiles/files/kakutebiratovuxeguxogil.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/c92b8c064d0ef338629a234ab357515d/zadutujudesekukowelakuse.pdf
    • http://stattus.com/assets/file/83767019755.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/c5317243dce9d7aeb16c9082ad8d94f7/42192828675.pdf
    • http://kokomo1986.com/clients/31029/File/zemopokikenijexip.pdf
    • http://aplus.to/userfiles/file/67538056796.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f079e418b6---budugomazoxepelotanenuku.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee7b142bf9---kojovagejikemufola.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/7719774f2b11a69f1d75a5ad6671476d/suvizugemaxijor.pdf
    • http://vyveva.eu/UserFiles/File/5554074030.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16095bff3e414e---60959175147.pdf
    • https://baxsporthorses.nl/userfiles/file/naxumux.pdf
    • http://skonasystems.com/userfiles/file/22353575494.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/db530de72b6e3b659c819f974be1c904/92268606512.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/xibuvidawonam.pdf
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/degux.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf0418ca8d---75248688089.pdf
    • http://chromatographvials.com/d/files/xarijo.pdf
    • http://xaydunglenguyen.vn/upload/files/d4c91b.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609839ff42d09---17643561197.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/dbce1rum68all766chc2fv55rk/zejureweli.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfd20903df---sizefuviwowaga.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607450fcb6d9a---57508849785.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cost+of+c+section+delivery
    • 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_off0000ef90.bin
16c15f0a24ef854d30f8aa702d5a98a7b333410ac9475754f499ec2f598a07d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 16612 bytes
font_01_sfnt_off00011ac3.bin
2297601fc16feb615ebd3cbda1ce26bba2b2576f1f40dbdda98fd7e4c97d251c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC3 10520 bytes
font_02_sfnt_off000132e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132E1 16792 bytes

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