Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d57aaac5cab58c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 10:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9342d16c871b045a70b39746d003d5a8 SHA-1: cc81c7e0e9a55000157b9bd42fcba3da9a36518b SHA-256: 36d57aaac5cab58c3285da30dec7502962fc2b16d28f90fb4bb0e864251bb508
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=android+push+notification+open+source PDF link annotation
    • http://budapesticukraszdak.hu/userfiles/files/12378001820.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/ronow.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/71150788570.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/dipupolirul.pdfIn PDF document text
    • http://orderkai.com/uploads/files/rutapunumulawexol.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210917_092540_163.pdfIn PDF document text
    • http://sinostandards.net/upload/files/tumofuwumukurada.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7944ebd2---60818660806.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/9dbab4771f8019c09dcf470dd0e485b2/76057663468.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/45045276479.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/lepelowutebabeluro.pdfIn PDF document text
    • http://runo34.ru/attachments/file/xafezakinidip.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/0636957e7a808402a4d25fe412c0cdf0/momos.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/52255220732.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/kisovaj.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/12388443549.pdfIn PDF document text
    • https://finliz.lt/i/File/97118127039.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210912_BB9C3E274FFD15AD.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/lagetufabimej.pdfIn PDF document text
    • http://moneymaker-gold.de/files/38599410835.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/sapen.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/7425573065.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/74475981252.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/36856482578.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_off0000e0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FC 10752 bytes
SHA-256: 1010d3f37b5443294711e0005af2ff14ba74a007a42979d0c4e53cb307ae623e
font_01_sfnt_off0000f9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 17160 bytes
SHA-256: b5319e20394e85980c7fa02ceb9df98225206a956bc75f32c79fad719d575454
font_02_sfnt_off00012644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12644 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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