Malicious PDF — malware analysis report

Static analysis result for SHA-256 655ab12ad553852b…

MALICIOUS

PDF

88.0 KB Created: 2021-07-01 12:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 051fdfb01c21f218bb5dbf97e772d900 SHA-1: 9748eab13524aa139b32646308e78e46dd2f3997 SHA-256: 655ab12ad553852b0ae7f43c9e2caadfa38660bdbb5ab204d8e4bd1034b442a1
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites hosting other PDF files, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious destinations, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7c3e0ac27---dudefupumulaset.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-5-7/20210507121535710653.pdf
    • http://fructusartis.com/i/File/zikekibiwixuvi.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/7eanjb4g6l1hevdqve67irt9t7/mudelagusaduzagu.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fdb181b4c---78318335195.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608400ab42242---92218504593.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16071911f6f798---54242240647.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/4462e29440a81246b0d6bfd28db6627c/guwipirefusufup.pdf
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/25105107077.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab615935d44---26946535810.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/am4e9uqujg73lo6op6i9slcs0j/46218686147.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609faca093b78---winuba.pdf
    • http://www.contal-farmer.com/uploads/files/jalolivoraz.pdf
    • http://atol-res.pl/uploads/file/refufuvaxudaku.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf0ca401a5---jixilefubonu.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20675ac6b6---vibenokuroworekibaxotopiz.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/729c9430e96ac3f0f36f06baeb227c6b/93329921449.pdf
    • https://andana.us/files/files/tisamitavuwilevudogitasil.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d17c2b2e09---53421405156.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/16f8ec566aca4e36ccb84f9f5429ff94/70829219310.pdf
    • http://cl-pub.com/files/files/3985718418.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/916fcc51c17ebcfe2f34e8f1a1c6b843/zurugevufaguvabapo.pdf
    • http://strategie-online.net/catalogue_dynamique/file/ninebe.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adee856d541---fuwogalasilaxo.pdf
    • http://andrelandberg.com/userfiles/file/fefojuzere.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=upper+intermediate+reading+comprehension+passages
    • 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_off0000f211.bin
982cb5bb9e33e4bf7038fcfdfbb140383af4e7d7e130c1a33d80df1ff4b36c9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 18016 bytes
font_01_sfnt_off00011f9d.bin
0f48f1fe7974a0569474d59abfc2c08125cc3fcfd6d9ba85922a8c6e7894eb70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9D 10920 bytes
font_02_sfnt_off0001387d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1387D 16792 bytes

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