Malicious PDF — malware analysis report

Static analysis result for SHA-256 56078d966fecd2d2…

MALICIOUS

PDF

93.4 KB Created: 2021-07-03 21:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3d7c2abe1344af0f36fae967b3af7c38 SHA-1: 384e3aed9200a0b38f28dd270d53ee1b1ec1b171 SHA-256: 56078d966fecd2d2ececef09e68d5d0c0e3952586651090b09b1d600e7343f71
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. While the document body is unreadable, the presence of numerous links to potentially compromised sites strongly indicates a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607501d48c156---tikotavamelagebutaveroj.pdf In PDF document text
    • http://e-sportis.com/images/upload/1150036961.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983e287f64b---46725793708.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093aa8536f59---62811257723.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/93923678628.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/0aao6cveuhngeks5nl15dhhet0/legarobeveza.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/e8cbadd060a2413adc84ca949aab3d00/2127099552.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cf86ba182---xarumogilofinapozoweniben.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e039340a36d---rukupomufutivurotu.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/5d2a89910e500018bfafbd1fe16fd729/71305038261.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed792069ff---fikaruvudog.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/36310344594.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/50991848070.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/780e12518006850b5108c04a708fe9f3/dezejosatametewito.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/8572fbt3u558p2jjk53i73ru4p/netivawetofefi.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/xegikumalifidoj.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/14877529041.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c683b743a83---14393503238.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160928ed6eb064---mofokogaro.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/5818097812.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/08a02121aa5b5d90f9804b3ce30cc9c9/11658850808.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160763b15ce694---gimupapusomedevifetorituf.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/f88c5bdc09451f51a6a55c31a5cc9f74/vivobofubupozofikune.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b18438be44---giporogemegimisezova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+install+lspdfr+gta+5PDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010364.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10364 18924 bytes
SHA-256: 61598fff96b7d7cf5279a74a8791e15a3375b56343fd4764a6560966f6d774c9
font_00_sfnt_off0000eb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B3 10752 bytes
SHA-256: 9b137484f561a0bbb94f25d2caf0bf3cfa2aa02569bb26aa12b657febc72ac9e
font_03_sfnt_off00013b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5A 17132 bytes
SHA-256: 83e924bad603ffe6c4f9eada6bb0eef6617051c0d112c4a46aae0f2d1c4a823d