Malicious PDF — malware analysis report

Static analysis result for SHA-256 f016e52e3649516b…

MALICIOUS

PDF

77.4 KB Created: 2021-09-07 17:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bef1740ba4314023d4317650ba805776 SHA-1: f5729bed99a9924bcbba6be4189cfdf54b227657 SHA-256: f016e52e3649516b62cb98454f0c010001881ec15c5c074debeebde7cf0f3984
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://synerhu.ru/uplcv?utm_term=conditional+sentences+type+1+2+3+worksheet PDF link annotation
    • https://nslogisticservice.com/userfiles/files/42932486288.pdfIn PDF document text
    • http://coffee33.ru/archive/file/vimidurisudadijukirar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa12145dbf1---dukorisatunevenolalasew.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/nafazonudunajitefo.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/miditulixutimugorizelevat.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c4df4dedbc8---6607489982.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c213c825624---zibifedile.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/14426211074.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/54178620894.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/d2461124fd1b3f2719d4955cf654d886/91811456818.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/29697474047.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/fokoweluzofazovakeledegu.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/mamozulederefuneweloneti.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/amel1bfrmkqi6s70fiva4nln9o/83589003571.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/23688572803.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/dofadi.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/kapevo.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/67420685769.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/jitilerutivonora.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/10200557824.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/71006517083.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161186309845bb---zejoloxepumivemibudewiwam.pdfIn PDF document text
    • 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_off0000c532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD49 11280 bytes
SHA-256: d152ec5ab1310c911f6b9748be7a22675c361b56b36d05ee5b0bebcb95070821
font_02_sfnt_off0000f7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EA 17976 bytes
SHA-256: 61af6b844179261381190003f5fb34e25f603ecdbaef73be2373c0982b6abb54

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