Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b06135f4ffe9ff6…

MALICIOUS

PDF

86.9 KB Created: 2021-07-15 23:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 43961c7cfcda37fabaf56e5b48ed0fd6 SHA-1: b3ddd1ac084870d087e37e6b1bdffa64ac2e259a SHA-256: 5b06135f4ffe9ff6eeeaef83e2e3ca42693e8adf7435783a83b91d7eff4a2586
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://sjar-tech.com/uploadfile/file///2021051906252316.pdf In PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/2354c52715715a7926caac7599c63ba8/zawevudij.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609837e5e82ba---vebivana.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4d184801b---warideka.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/kekefinavafo.pdfIn PDF document text
    • https://schmitz.cz/res/file/13269204346.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f9f1ae555---7966847648.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/xoputapinus.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160817e8b0cb70---39828669170.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210624_803FB1967F4994D9.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/4c1e71b2e09b16dbdbdd17338144644b/ropexonigiweli.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/69446966553.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/69223250317.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/lewuwosenegiweb.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/uv4gunmvpmj7uul3v8val6pqn4/30298492495.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/6a2d0e7347919135c4c142f299be8c93/rewawumubebuwakulolaluvus.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/wenirupot.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a0389714c486ad8a4a3ef21c21f45218/65578471571.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16084e88210622---51771567366.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/9250d832a7ecb5ab048334de0f2bc4e9/84544098070.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/gadenigepoxusezizur.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/79331748684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=styx+rock+and+roll+hall+of+famePDF 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_off0000f083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF083 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10895 17424 bytes
SHA-256: ae4765ddf903fcaab2bdcfdfd2fff166ae3dccac715e53eac34b6b5cff3c7cde
font_02_sfnt_off0001359e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359E 10864 bytes
SHA-256: f18c355305c20a0b68a2f093322a5283b9aadb1b2610dcae7db6b7c9fc1db48a

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