Malicious PDF — malware analysis report

Static analysis result for SHA-256 a017eaea34bb178f…

MALICIOUS

PDF

85.2 KB Created: 2021-07-02 04:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd7b96d827a9e607a96077e371828af4 SHA-1: dc771a08a82d7a8438a949b903a7c5fe062f4e04 SHA-256: a017eaea34bb178fac87439c013ee07bc9cdf60ec9c4ab21a6556dda9be91976
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple URLs, many hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the detection results suggest it's designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad5c977e6---32829782837.pdf
    • http://samafb.org/uploadfilefiles/97586444977.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/hmd1eitv6mbi2igqgn1vkgv5go/19591538263.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/4b80d8c4bff370c67f24244c3a45b2d0/nufinosegudapur.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608d89650e0a2---gasusulujuwokode.pdf
    • http://weorderfood.com/uploads/files/puninadopidukupivuf.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4fb774250---pavewisukodabis.pdf
    • http://mebco.ru/images/file/norekagakoxozolel.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/28842b03606ed25d7462fb63deaffe68/wiratuxokotatuzoxisezar.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/kp95lkf2d1vndo6ner8sr9ba8t/taturo.pdf
    • https://xo-sound.ru/userfiles/file/90976667857.pdf
    • http://mcutech.net/files/65026445888.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8b7521f04---64010699444.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b488d8cacac---53169280589.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/2frqil55hkqvhh9g7a3p2115ak/57750439820.pdf
    • https://newtech-utm.pl/userfiles/file/67787792288.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3faec3bb6---82641852526.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ca144a09af802ccb90791d52bde4634b/12808318275.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de0d6d6b51---kakesarerati.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160718654f0218---75533376068.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d7c6ab8df---9698833293.pdf
    • https://serviceservice.eu/userfiles/file/tikuzapofarutokiviliv.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702cfb4145b---8882039581.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=weibull+distribution+example+problems+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A4 16792 bytes
font_01_sfnt_off0000febb.bin
6fd696908c2e12fd403a3b16586b93792fe85689e59358e1dc0cd346c6b544c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBB 10992 bytes
font_02_sfnt_off00011800.bin
056aa4b9714471b7780e2d109eadb3a24cb25a4084c5698e6c8c56b78302193c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11800 18020 bytes