Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1fd9f90096e5fab…

MALICIOUS

PDF

94.3 KB Created: 2021-07-15 11:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c013ef159e77699e5c6a78696d18c20d SHA-1: 42ebc919faa358fb5b184b505f6f9871c7fa4d70 SHA-256: f1fd9f90096e5fab68e5979e1185409d91ce3d8ae4e13b95cb404131d0a7f2e7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The primary goal appears to be directing users to potentially malicious content or phishing sites through these links.

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://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/303655acae0e75685669c5829d21287c/99253987729.pdf
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/20644834413.pdf
    • https://aslimitada.com/userfiles/file/tabiwamadipega.pdf
    • http://werkkledingverkoop.nl/images/docman/files/87613743208.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d099ed05282---1613780142.pdf
    • https://apsco.ly/userfiles/files/78451267603.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986d1f7ccf7---bijixo.pdf
    • https://mamo-tato.ro/userfiles/file/rademit.pdf
    • http://teplospectr.ru/images/files/rasopalulejepategodabave.pdf
    • http://odpadykj.cz/UserFiles/File/80254861172.pdf
    • http://airconbank.com/upload/fckeditor/file/petetije.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750ec3717b0---goregemokerevawuredu.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/d83af7d8fa6f271ad17a4a9acf38a60b/51056821383.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22598d233f---tajubosadimazabotax.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9580a6524---begijukizire.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/52e08a3052288bc37e49abc8acbe6663/dezixokosukosad.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/231f2a503b1ac53542fde361f116cb4d/pazogagu.pdf
    • http://happyhanool.com/ckupload/files/16504372924.pdf
    • https://avistravel.ro/userfiles/file/84486351035.pdf
    • https://eliteplacementagency.com/uploads/files/sonufalululixilovis.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/188e2fd4d152398d85d9c982a748f401/97231742508.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077956303721---jekulunakunevomunadu.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c5d0b7f9d---xideloz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=2020+four+winds+rv
    • 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_off0001111a.bin
88980748f980a75e7b9ff16c6f16124cfd2285d95d0b19129322b41af228aef3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1111A 10308 bytes
font_01_sfnt_off00012878.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12878 16792 bytes
font_02_sfnt_off0001408a.bin
09b473fc68d40eca3f4baa22227636b292b15e51010d3bf29135e1a476ee5bc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1408A 16684 bytes