Malicious PDF — malware analysis report

Static analysis result for SHA-256 4711550e4c8a5f41…

MALICIOUS

PDF

83.9 KB Created: 2021-08-15 20:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cf4b0baa9baea34c8cdc7dd4d8665658 SHA-1: 0380865767d2cf222ef5c0b8e26cb1cd02ac9c6d SHA-256: 4711550e4c8a5f410ca8485978de6e494a7d1556a050ec86045d9d81a59d18c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further payloads. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=mitosis+vs+meiosis+cheat+sheet PDF link annotation
    • http://www.fashiongale.ro/userfiles/files/75957737727.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///42721515706.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/gekozopif.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/271ca14830b7d1c6fabbf636b50baf64/pozodojawir.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/200eaa5eb6534ed476e35e39d35cf11f/bigajuputivurajirug.pdfIn PDF document text
    • https://lamthong-marchph.com/piceditor/file/6550152253.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/65842540850.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210723101732_o7z5za.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/9056306081.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/p0v8cq3p26qos9cgdu118j2r6s/79511782775.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/podajazovefokaligi.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/68269634842.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/m8q4pvep8mcgi3u2rn68s83nm2/movirotiwali.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/392fb3d9ecbe2c1ba29ddcdb8c1f4c48/mewetewaliwubagaxi.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/dugejuwimeremebeku.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/75764976769.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/vekop.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/85b7461fabf882088362552e925b3413/sowajivuwaberamaba.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/029c315f08a491eef7ab38ac1dc66eb3/71516039926.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/48533253018.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/14755958091.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892e45d6521---kovaxekusabekepim.pdfIn PDF document text
    • https://edusfera.pl/upload/file/lujotuse.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_off0000e25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25F 10304 bytes
SHA-256: da909fd1fc198f2b90a1fbea32d025911d6ed350772ddc0a59f45077411f2818
font_01_sfnt_off0000f9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AC 18108 bytes
SHA-256: 8460fa1b27e82c9a1b5aba9e59b8fec9e3a3e679f3852a0a4dd078e9da3167bf
font_02_sfnt_off000128fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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