Malicious PDF — malware analysis report

Static analysis result for SHA-256 1774938bc31e0986…

MALICIOUS

PDF

85.7 KB Created: 2021-09-04 13:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 20aed6f5b5f2317ad7b95921daaebc51 SHA-1: ff8d8b54e8703db1fdb0a1477374389ae3cceb9e SHA-256: 1774938bc31e098665613091605f9d33f9f2a8894acbcc6e330dafb29b0a8e4e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to redirect users to malicious websites. Heuristics indicate it functions as a link farm on disposable hosting and uses an invoice lure, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://szyldkj.com/luodan/images/userfiles/file/89416438772.pdf In PDF document text
    • http://pwr-tech.ru/userfiles/file/zinepupimumutigepu.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/89442689659.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160862ab77653b---diwidowej.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/7g55kfang56fcnbi2hpuon6gnh/96671909107.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/63662311812.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721e2832c49---kewezeno.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/pebununulej.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/jutuledezulojifuwukus.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0b4c60581---91381239700.pdfIn PDF document text
    • https://spacio.hk/attachment/file/kupizu.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/98003233671.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/25942523755.pdfIn PDF document text
    • http://airsoft1.ro/files/file/58447692723.pdfIn PDF document text
    • http://p-energo.ru/content/file/60253018440.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/lalamotuxigijowivixivugax.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb022acae3---taxafapurunomebitanovaw.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/gumenubudodabufesizunoto.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/44772586157.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/be5ad1304939d581b53391f29654e7ac/xavexen.pdfIn PDF document text
    • https://bursac.net/userfiles/file/kifedowijenoziso.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/mevidusobepidosinifuj.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/92773115768.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160baa101f25a5---14641915085.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/a02783bd5e35360b0a8233d60f7184ce/25008168229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=half+the+sky+kristof+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF06 19056 bytes
SHA-256: d9b3094d38ef3421a2158903fe019a141104746b46e108701af135892f20e331
font_02_sfnt_off00013042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13042 10688 bytes
SHA-256: 2a8f473afe2268dfa41502f4b42fc0678bb0d13a35056b9804cd0f2239bc501b

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