Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf00d6effa29266e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 03:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d1376a56b280c3d75ac589f55a9ce64 SHA-1: fb7522201a896a0d2bf159ada9a49ea48dbe88a6 SHA-256: cf00d6effa29266ea2f026206f16899e732eff82f2c7afd564237bfa2383ab28
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of multiple suspicious URLs points to an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://mitcostruttori.it/userfiles/files/vivowusojiki.pdf In PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/2b304d508b49b042586db778acc58f47/lobomidivetozuvidum.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/wekutoji.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/basekabofogaturuwavu.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/119aa414248053ce89424edc0c7fdd9c/65826404782.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097f81e85347---92797402973.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/24439473302.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/62356071241.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/90b5d55b4dfeef846c969fb7cc6c846d/lusuxakidosegejiresenupu.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/suxes.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/97775243366.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/rijojumaxe.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/45052933667.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/80cm23hkglmou12ph6d4engi43/68456230273.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/kutozukuvaxad.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/95346191103.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/gowet.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///jawikofurafudu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127170a8ca73---35682281119.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/69586492184.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610b6d509fc2b---55695459538.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c076b02f797---kenafapa.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/112828727310289d8ea410214eb7afbf/norerujowijokiforisarugig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=federal+direct+unsubsidized+loan+interest+rate+2020PDF 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_off0000dcd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD1 10880 bytes
SHA-256: 8d1cb3146e0f19c5baf596dd27d267a1b1c99c41662187077d8117fdfa4db4b3
font_01_sfnt_off0000f61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E30 17964 bytes
SHA-256: a36db98d429eda6dccf668446c0a4ff3ccb314c75ecb3c68b3c6174ecee0a3d1

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