Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b46d556488f7543…

MALICIOUS

PDF

90.1 KB Created: 2021-08-04 00:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d8f9f9bf9498c6fb4aaf7e9b79d2364d SHA-1: c4778f22e08b9f056f7cd1a4d48be3632ae9eceb SHA-256: 0b46d556488f754322abcb3921fd6d7e6b0953f6030528b8c72b9c774cd8a3b4
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal that the PDF contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. The embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://krisoc.ru/uplcv?utm_term=what+does+smell+tell+you+at+an+autopsy PDF link annotation
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ad8c2f623---66914434056.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/aa49dcc359125085884e5b860e793a65/77104391612.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/71177423842.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b14818b0a4---68950886665.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f314bca13e4---45217280444.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/fivilawidegavej.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/19382892310.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/83704cd49e33fc728304247e3f84cf78/wepujavujivesanarogozux.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/939b3fe62e131e6907e67dcf7441e159/99430091194.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/47050782481.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/4772469055.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/56b74a08b1d0a1cd9184650cd7d15b9d/zusinekulinejig.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608398a831b2f---75272706042.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1fe0d3986---34176123855.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/40101430921.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/ligifspl3n0om55p5vqcflsei6/fefuza.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/93421814937.pdfIn PDF document text
    • http://linza-market.ru/upload/files/76019892363.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/86137157714.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/salakevinutiledimod.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/3657441447d7fcbd67f506455f09ee58/sisuxodu.pdfIn PDF document text
    • http://traffic.libsyn.com/coronertalk/Odor_Control_.mp3PodcastIn 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_off0000fdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 10672 bytes
SHA-256: 497cb3eb904266437eadeedb01bb352896230e85faed3711142834ba9e48fb90
font_01_sfnt_off00011604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11604 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E16 16732 bytes
SHA-256: 19d361e965a01083374228f71355629d9b6559c2928f383d77b079277601f4bb

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