Malicious PDF — malware analysis report

Static analysis result for SHA-256 010d3b8eead507d9…

MALICIOUS

PDF

76.8 KB Created: 2021-09-05 06:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f651f3e73aac321a71bd3103f0f239b SHA-1: c5f25e3de53eb3117005afe7824e1d4eaf2a0a4e SHA-256: 010d3b8eead507d919dd2dcea4a649b7204f1537ef11639e02698538ddd70364
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, directing users to various compromised websites and potentially malicious download URLs. The presence of a 'download button' lure further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=husain+sattar+pathology+book+pdf
    • http://clinicaveterinariacene.com/userfiles/files/31794495732.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/aj1rrotdo55acsa4hd08rn7gol/roluzuka.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/japoxujoduwa.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/1849dd6460ce560595c29104bc0f9ead/mirilej.pdf
    • http://lasfyy.com/uploadfile/file/20210613091723889.pdf
    • http://aescantabria.es/upload/fckeditor/file///mezuposokatiguv.pdf
    • http://goodwill.pl/userfiles/file/vorifumafe.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/4937b8409a6081831b1552df49ef6e8b/65580318200.pdf
    • http://candybeauty.vn/upload/files/kewesubuxatedajod.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b687c8bf38---rononasapulekebotuxober.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/9b75526c45e126e711cb2ac00faf6ae2/83483248993.pdf
    • https://ntc-container.com/upload/files/rinexabu.pdf
    • http://kiiga.ru/userfiles/file/madasuk.pdf
    • https://www.mnogotrop.com/ckfinder/userfiles/files/56379181151.pdf
    • http://vetranhtuong.info/luutru/files/77086770974.pdf
    • http://alacartedesign.de/userfiles/file/27574213758.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d91424158e75fb435adfc977db3fd81d/musilajunate.pdf
    • https://acgroupenterprise.com/userfiles/file/betogajewi.pdf
    • http://www.jindatunnel.com/up_files/file/16066876461.pdf
    • http://www.dr.schure.net/ckfinder/userfiles/files/pogawegawaligelur.pdf
    • https://ildiko-szepsegszalon.hu/userfiles/file/51285946438.pdf
    • http://thecuriosityshot.com/44801260105.pdf
    • http://abwnickersonplaza.com/uploads/files/27360900426.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf5b651831---31410404240.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/62143245042.pdf
    • http://www.urbanwaterways.info/files/bofelanijunisemosobus.pdf
    • 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_off0000c91c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC91C 16792 bytes
font_01_sfnt_off0000e12e.bin
d90886ebaf1fa41f74518a68d6232e2a0c47c7a5e535f99c369debfead501661
pdf-font-stream PDF embedded font (sfnt) at offset 0xE12E 16948 bytes
font_02_sfnt_off00010c54.bin
87204137384d531308f193c86045a2816f5c377d2101a9f82bff1c2cfed4b727
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C54 11084 bytes