Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c91b2c60b866fee…

MALICIOUS

PDF

86.8 KB Created: 2021-06-28 22:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ab17faada262db2d2a0518d75e0c2311 SHA-1: 3aaf58999f3429caf3e94e9e9bee806b711384b6 SHA-256: 6c91b2c60b866fee8bd2b8d54317155ff3a9dee10633acedd3d6e373456431eb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous URLs hosted on compromised CMS uploads and disposable domains. The primary goal appears to be directing users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://philabc.ru/uplcv?utm_term=guided+sleep+meditation+for+weight+loss PDF link annotation
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54fda300e7---koxinikasixuvavafeduzugin.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210603100448311290xm6nc5.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/30348114172.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d61fae693---siwedulufatubasikilugi.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7579e1caf0---36712917072.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/domiru.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/86847317133.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/caed7d0nnn8m71im3hipabj03h/92796378152.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/6lgji9egfrc9j3vusf24i3por2/gitofuxaxanem.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/tjmbln4a9jh1pbsjfvpi9nqgh5/12352882086.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/6009978514.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf1d0395ae---sopakiwodotalugedumo.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/bajotaxobolefososokivez.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9c5c8efa6---rakafigabosowibonelakemov.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/rimosawakadonimap.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/23400219462.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/mirakotuwuvifepuvij.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00c9864bcb---kujadozogavawi.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160703118b414d---70420188829.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/baxenafete.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0d0069997---29297197199.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_off0000eef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF4 11172 bytes
SHA-256: 68c493cb60c0081bbfafeba6b414aeaacf0d23141284cadab956db8e994c0de2
font_01_sfnt_off000108ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CC 17584 bytes
SHA-256: 73f21b1e991c49f4e3b85772092f0d872bca85aff46e69636925e8f3fdd4c87f

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