Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86f8ac55191eb5b…

MALICIOUS

PDF

86.3 KB Created: 2021-06-26 10:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3c725bc1ec81aa41db01352bb5f8af9 SHA-1: 9f9d2aef5eccb8abfde3c6ded5c0c7a47f119fee SHA-256: d86f8ac55191eb5b9df92281f581ad73782898fd7708bc95e76d8b7746cf02ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the heuristic firings strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://qiangka.com/ckfinder/userfiles/files/danavavaxefutagativeme.pdf
    • http://toshiteriyakiburien.com/uploads/files/381205617.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/20c23dbbb152f2243d09f67fff8b7d31/67487628437.pdf
    • http://esoftland.com/userfiles/file/49672189357.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6ee01676b---vitozu.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/e77454814d5e70d13585fd514b497382/ligizonan.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d055f6edb3e5f0f9f7bbb969c96df5f9/parovidesixedebopa.pdf
    • https://lawina-radom.pl/files/file/ponowelipesulewerobodebi.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160868b99b9725---78914768000.pdf
    • https://fullhousetourism.com/UploadFiles/file/20210526125653173.pdf
    • http://agcslohian.com/userfiles/file/vasag.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/f9km6k7ino5j4kmegmp12b5g14/45867175850.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/88610794294.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/85qcj74hsgasv1gck7on3ljfk4/23368170498.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/b6957e1b0cc97cb1fab60527841c19b7/37044473354.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093deaae8e12---18820181045.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/6e55fhcqfbed8u68iie6q5k5sh/tujoromelibadud.pdf
    • http://actybrain-consult.com/Upload/files/wonaxuwezinaduxik.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b1706df75542c93fe917096fcb23df4e/tonowev.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/a651eb3fc9524d7908f1b741d51164e0/dafedux.pdf
    • https://cochleartudaskozpont.hu/files/dejomituwokokabug.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c56bc75503---67884018267.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/009853ce01e62ec7c7678b97616a9591/xokasexitigakebibakop.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/ea9f958c2d3f4dc5029759a96787890f/23013059582.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cc1d2f452---sowejeteve.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=find+the+next+number+in+the+sequence+calculator
    • 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_off0000ec95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 16792 bytes
font_01_sfnt_off000104ac.bin
3bc7adbbe02361cede52366f12d68909f58f9895a8d8c193bb349673242c54ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x104AC 11100 bytes
font_02_sfnt_off00011e1c.bin
d280121b0a515eb2f906cf828307b41521462acb77ff1606d2753741080c86e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1C 17180 bytes