Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e728ef9cd61aeb6…

MALICIOUS

PDF

71.3 KB Created: 2021-09-29 13:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c060ba7fb1b1b45ce25dfc3cae6920d1 SHA-1: 8cfe69936ef1d8693f04e60ff46efeae338516e5 SHA-256: 6e728ef9cd61aeb6f596dbbd182d82b948956826377cea58e00fe36d73b60b28
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs and link farms hosted on disposable or compromised domains, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no direct clues to its content beyond metadata.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://catamma.ru/uplcv?utm_term=photo+that+crashes+android PDF link annotation
    • https://es21sys.com/userfiles/file/13996931276.pdfIn PDF document text
    • http://edituj.cz/res/file/95712106592.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/88205373822.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/tugaxut.pdfIn PDF document text
    • https://aayams.com/userfiles/file/67107094998.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/tixaxuwenamen.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/86284111189.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/33527127082.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109161258487827.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/murusafozujasuzibike.pdfIn PDF document text
    • http://01host.ru/userfiles/files/naguzosirebapuz.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/zapabiva.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/somiweritovul.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/72720138302.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/68891243246.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/vikimivemu.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/volol.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/74886711889.pdfIn PDF document text
    • https://equalland.com/uploads/File/makuposinanusasa.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/96801958214.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/pasedekibozaraganejuse.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16153e10166af6---35070978672.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16151b08fcea67---8540340680.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/351ef9436d31e420efec587b18e67787/59544901592.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/0415f9af66f81c2b378b74270d69b09c/31547111567.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021091442833_1008089750.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_off0000b529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB529 10424 bytes
SHA-256: d2abf1d548640df27e7c372aec98da22a5faf554124078fa69c893d050ccc663
font_01_sfnt_off0000ccbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBB 16728 bytes
SHA-256: 93f6f82b20ee9163e606b8c07af11fd2a29dd02fd6075bd6ca8fcfd8ebfe076c
font_02_sfnt_off0000f792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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