Malicious PDF — malware analysis report

Static analysis result for SHA-256 4485bd3e2029b64b…

MALICIOUS

PDF

86.2 KB Created: 2021-07-04 23:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9ed46159de5e8e8bc24ef2f63c705351 SHA-1: c0199922419cf867866fc7e36da908574631aff6 SHA-256: 4485bd3e2029b64b6440bed9087daf6d1d291dbae9ba7079bd632846923ca5fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or malware distribution lure, as indicated by numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://infrive.ru/uplcv?utm_term=the+world+of+art PDF link annotation
    • https://0900107678.com/upload/file/nijelevezik.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/28051292665.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/7670cdbb43e5bedef19e922b296e6db2/gibupupodono.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/516b3da895a32917c01ceae5377ff998/mebadafuk.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbdd234a63---87628162119.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/5232542565.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/86nvq047vj2l9b7adusaebo353/29389053538.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/cb557bc03a0feaffeefd96537da99f4c/nugivu.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/fhnursrkj2gfic6qpf21s4kal0/biwufemularolafebigu.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160d19fddbf7c4---65230708870.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/47368429083.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e14100273---zodazimaras.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/fb689ad6583806630b192ac235cc5b34/11172022222.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/b618fc6064be3e30ebd1d8fcfb0af5aa/26068767773.pdfIn PDF document text
    • https://plasy.com/uploads/file/baxojabutebuzinapof.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086401fa8caa---80359370384.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210625_030618.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/jigejivevetalunitetexo.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/fozikexi.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a80ec85611033988755950f79bb6783f/pexiledovodawuz.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/fa95038f4437a55b69e597047c4a00c6/nuvupajilurexizujepe.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ac37d3c31---darefuxenutawukeleben.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/e4c1645edb35459760f3a7c4c2440afd/ligidamoroduseg.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/68560900825.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9e4e4577f---tinulevumejogetova.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_off0000efb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB6 10136 bytes
SHA-256: ec9400c0d6635dfe92ca0ed4cd5f3cda812e5b7d94b8aabfe08b74d0413d4294
font_01_sfnt_off0001069a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAC 17472 bytes
SHA-256: 3079a214b49a3f379eb1e24c698f0e0bd404169adbaae9c21432915f08aed1d4

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