Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6670d84c5a01d00…

MALICIOUS

PDF

75.2 KB Created: 2021-07-04 09:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6dedcabd07a4e8a438195698bbf8b776 SHA-1: 7f279256bb0ac2a8c3f68ed3691b07ed052d4ac2 SHA-256: f6670d84c5a01d00006b6c88444ca7155099305506e7aafde20d185d0bd7c48e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised CMS upload directories and disposable domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://allytemp.ru/uplcv?utm_term=weld+county+vehicle+registration PDF link annotation
    • http://pelesiuvalymas.lt/i/File/vatuvididusizojud.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bd6d5afa1b9fb8821da955fba8a96d5f/laminimapaxinewelupavuvu.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c742f615c7b---kudupudadolotorat.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa2f3cdf54---77304305151.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/9ece566534175a647fe783dcdc2234a5/wikaritobuvitalolig.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/tabuwefezugefifilok.pdfIn PDF document text
    • http://zxsolar.com/d/files/67474642079.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a19185be6---sopusodituduforigino.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/77798f9b278077bf4acd47feea43a577/14696421348.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/ca06cfd650b7ab4c6cacb71e73cc7753/3450965953.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abc0905b71a---gajajamamakesojegezad.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc288240d74---kikujejujodel.pdfIn PDF document text
    • https://chp-travel.ir/data/file/xotiwiveluzesubivaxov.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/75742616093.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092e9468a790---1149623592.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8c3b628288243dea3b1e10221c01fb38/12356117936.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/jewepenadepep.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/a111b45f9bbdb35e9163d320a4ab8c20/fuvipotenixe.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/lavosamapaniras.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/pitojom.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ajafibian7r8qk6hafgqjfnsj3/pokivuvidetu.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/dogomogibarutoburubuwa.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/27e2463eb205c56923396b83097a36f1/vevomopegovewexadunebi.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/6c928ed164633fffcd071e0ff94d8521/54318805717.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ce3098b45---13208757519.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/bazuvanegaditomeke.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/jilaxomamositofukit.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_off0000c31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31E 10920 bytes
SHA-256: 453735e77a4a25be41a64aec5fae575548b199b2dcd2f40f0d10e78778e378bc
font_01_sfnt_off0000dc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2D 16472 bytes
SHA-256: 7aa1f5a878573c28f84aedbf6bb8096d2f705ed4deddf2a47bcc9befcad99f05
font_02_sfnt_off0001071c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1