Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d0259b413393b25…

MALICIOUS

PDF

73.0 KB Created: 2021-09-06 20:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aa03308f6e27339cf546256466a78122 SHA-1: 93c3aa1432b95b86c3ede99da4694b8456bcc1d2 SHA-256: 7d0259b413393b2511001d7193886144ac15247d5d8f903ee1e6673f166137c4
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains an exploit. The document functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. This suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thietkevuphong.com/uploads/image/files/roneranusijozosimamudi.pdf In PDF document text
    • https://keongracun.org/contents//files/jisafesajep.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///wagedunezeguvetem.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/vutikor.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ea8mn9jgm6st9ikpbpa4ifa6v3/26712670762.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/27ff40e1e1db7c39c8ef2c7d882df338/rapebadefefa.pdfIn PDF document text
    • https://glory-aqua.com/userfiles/file/zosusoruxu.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cec74255c17---41181840700.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/16219339319.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/nogirojakosososonavupagef.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/5168c086915ae4852b953fa3f2eeef81/kurezokujakalutikolelugo.pdfIn PDF document text
    • https://akvaguru.hu/user/file/bakogigotekitobazikiliv.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/49783431049.pdfIn PDF document text
    • http://oinworkshop.com/clients/6/6d/6d9161a7191ba42f41383a85782e2f4f/File/bizaninozagabogaxut.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16072c3721784f---jolik.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/36090896918.pdfIn PDF document text
    • https://rm-parketi.si/uploads/59222766878.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/46332330481.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/59c168f10fa07a072231781c4e927c02/71602140444.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/36126081905.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/2b8ca5ec566b606ede3c7354255d2e40/4919513646.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/vawatunovolobemira.pdfIn PDF document text
    • https://masihpt1.com/contents//files/kojagamede.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc79428c63---59108841618.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ai8ihufk4cl2080dhro19upcm0/papuzepakomidebixujimiwi.pdfIn PDF document text
    • https://ivanamihic.com//files/rotofivaxabapekebofadowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=tenali+rama+story+in+telugu+pdfPDF 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_off0000ba54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA54 11016 bytes
SHA-256: cc55198cbdf1d9a4a059d280353c69638240917bd3d8b7502a29d29dbc59424c
font_01_sfnt_off0000d3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C3 16532 bytes
SHA-256: 2eaf3b09c909fe467130852e77a4a04f7a8b410f65b479c1586f64ea66de2d72
font_02_sfnt_off0000fe47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1