Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde9ddbe770af087…

MALICIOUS

PDF

79.7 KB Created: 2021-09-01 19:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b3bca25696be36b27c6ebcc7a6c6d5b7 SHA-1: 1fcf845fe586fb42a7b216d0e4b3252e42dd198e SHA-256: cde9ddbe770af087a43c5088ad662a49d120558a6791dec211a1aef5852ca8c2
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://cpk.by/ckfinder/userfiles/files/loxorenunozer.pdf In PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/ai2fpij9rl5tm5g9b2l3sm4m2b/xamuvexonunavuzelaj.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f627a937b---jatamimal.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd7be1bf5a---rofodejososebori.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be5b9f31829---16036629253.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/vodalemijetabijewes.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e3a5573d1---gidorurawalakubu.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/tedewi.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845d03a127c---zekogefereteke.pdfIn PDF document text
    • https://coil.hk/upload/files/pamuwu.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/xazuxodanegakidi.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/91145443629.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/fusejajef.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/28248410449.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/60961189850.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6c82dba3dc6510aa1c41722c11c0f7b6/vepejimudovikinuxoro.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090e5f6964c0---34062298438.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/93256437834.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/5996731255.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///lapapunejunowijazevizo.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4021e5a94c---kosalaxo.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/rufama.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607255b338604---89067116024.pdfIn PDF document text
    • http://saydersan.com/firma/files/wefobufogolapipasup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=project+euler+solutions+c%2B%2BPDF 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_off0000d123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93A 10292 bytes
SHA-256: f1f5826baf0b9c825f12fd5aa74441f5702fb3661d913f8ff6d28d4fcbfd8ea7
font_02_sfnt_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 18372 bytes
SHA-256: ed566a1e17fb6bb0dda69e0e7226f019369e3986b43c5a82dbb8103ed434ddd9