Malicious PDF — malware analysis report

Static analysis result for SHA-256 4941a9033c0ac594…

MALICIOUS

PDF

88.6 KB Created: 2021-08-06 18:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b67d85d53dbc2e77258972edb48e70cd SHA-1: 172b7fc39aa0e3a21a7f1b8f7201a1ed1e8dffc8 SHA-256: 4941a9033c0ac594a190886b956aa89cff6f148c39654035b93c3911337d1150
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains multiple embedded links, some pointing to compromised WordPress sites, suggesting an attempt to host malicious content. The heuristic 'SE_SECURITY_BYPASS' indicates the document likely instructs the user to disable antivirus, a common tactic for malware delivery. While no scripts were explicitly extracted, the nature of the embedded links and the security bypass instruction point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/aas8fbuenq3r3kut9q48bl3uq2/27342249639.pdf In PDF document text
    • http://babyindex.nl/images/uploads/11884568183.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/vasavavejutagoxusukijot.pdfIn PDF document text
    • https://tonitomov.com/picture/file/41756321788.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/550d2c3c51e7f4a85a9cd28b9aeb3f4e/wuviwekesanafirafujes.pdfIn PDF document text
    • http://cortabellanews.com/userimages/72566080520.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/78804152030.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/abac8j9gsb7akqd65kg2gmdvq5/xilaxexadanel.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/wodimuximowagijerat.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/14559050738.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/548ddb3e18b47c3000bd7a92334f3d1f/gesanimifekaduxokidinu.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cb797213a---fasibi.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/pafuvozuginamofotodo.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/332e8886a38c8fd4c8b2b73c49d9cdc3/37165588309.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a3637101cd2---sigapukebogemexitebavemab.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/wugafafemamotikixe.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/7281724929.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/7eba7kiqd1ogdat7m8js8k37r4/peradidozuz.pdfIn PDF document text
    • http://clipsttm.com/userfiles/file///dusireguzalefofanudezujo.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/47286244951.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/044lcigbf7osukm29a85no67r0/jisikopimejonino.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/zavubepakulalaligeniju.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/55374360355.pdfIn PDF document text
    • https://virker-ikke.dk/files/40097651301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=llama+gabilondo+y+cia+vitoria+380+magazinePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE4 18756 bytes
SHA-256: e189a0adb94198eeb278432adb59e76ec8ea53e61faf58ccc2a0fb23e79fdd20
font_01_sfnt_off00012051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13868 11384 bytes
SHA-256: beff456ae1301c595271abf3b7afd960a97a8bce6699366642cf4e17bb2caded

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