Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2644da38d791aa…

MALICIOUS

PDF

84.8 KB Created: 2021-09-02 06:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f87a0ed58de06ca546b9a60d8c79b726 SHA-1: 607af017709439443f529af2e058e887502faec4 SHA-256: 8a2644da38d791aa1b80a99f1c99041b8030a2499d26fabcd22800fc7f707671
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. No scripts were extracted, but the presence of multiple external URIs indicates a strong intent to redirect the user to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://pistant.ru/uplcv?utm_term=iser+the+act+of+reading+pdf PDF link annotation
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762ca5a94d6---72045020907.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/00lh1r6bumtilpv3lpg9908r2s/188769156.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f517561555---razumetemiribaluzi.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607925f11b8b3---wanozodaporemaresujemo.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/59491662770.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/32998331783.pdfIn PDF document text
    • http://hongdacable.com/d/files/13112725551.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/85875275499.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610c20cd46d44---21277779063.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/75895765126.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/87000825335.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/7dffa9b681b86fced02e330dbbc5b08d/gupatasepeti.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076a1aaf416a---89890326309.pdfIn PDF document text
    • http://dzbnf.com/upload/file///sidogix.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075013a18abe---3425748270.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/38c7680d75d3418e04f409067b1b076e/rurix.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/19b95855a1d4f57e04abd56fc4589200/91886565048.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/vu9va9oebm2ridhjapvnhbk7o6/bizopunoxiworofax.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/22790575739.pdfIn PDF document text
    • https://go2germany.ru/files/file/febolasuzupenaxupujosugo.pdfIn PDF document text
    • http://narimasu-chintai.net/jcfiles/file/fateratisodoxemutegesem.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/72593cb509cde13e4df76492d677633b/wugakum.pdfIn PDF document text
    • 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_off0000dfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA8 10804 bytes
SHA-256: d9c4cf0829d719ad4ed8d86d3850b1c461b23de1e71bc56407acf4365786c119
font_01_sfnt_off0000f850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF850 19968 bytes
SHA-256: 6a0b371e6cda7f2a1230ada1896c565f7f9eea2444ac24aacfb2089b6bb37d7b
font_02_sfnt_off00012ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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