Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f3b64f68f67d7a…

MALICIOUS

PDF

77.7 KB Created: 2021-09-21 15:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c7aa5b8cb3db2aaa0b6c9c6df359ca40 SHA-1: 0168e77ada7217c7a760904bdd41dfb023ee242e SHA-256: d1f3b64f68f67d7a5d8f19717737cbfc0f540c1123eab44b16bdae5ca8cb76cf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to exploit user interaction to visit malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://infrive.ru/uplcv?utm_term=chrome+parental+controls+android PDF link annotation
    • http://flexa.cz/docs/file/4645801194.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/23615234644.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210918_A56B548FB2D4392E.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/09d8jk6114aalhfmaeb7sd0091/kifujajotomumesutoto.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/muvurejonipu.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/jodimeset.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390fc1061b4---gavaletoloxadadeg.pdfIn PDF document text
    • http://christopherdallo.com/file/kubamebameb.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/parajakunapolawumutekeg.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/wuxuvoxitaxomiwenaxarunaj.pdfIn PDF document text
    • http://lobi.md/userfiles/file/lufobaf.pdfIn PDF document text
    • http://ranch.pl/files/file/binubekogoxeduwovidase.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/neged.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/nurulopomivinaxali.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5325a5420---vimebezogijuxuvoxubuta.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/e7dc52e0a8079a4733360aceabcc97df/jenikofonufefevidifa.pdfIn PDF document text
    • https://glozor.com/userfiles/file/79275570736.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/mokogezijobinuvasejanam.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/7fc804tgh1hrb9g2i8tl3rkpsp/44969396449.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/saxobowevi.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/94777077196.pdfIn PDF document text
    • https://ismart99.net/upload/files/lolisexinotavodigufifojed.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_off0000cb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB12 10808 bytes
SHA-256: 8dac5f1acfa202dbd28997d1829e09e26a361ee07cc0e34792d7b7683c5674b9
font_01_sfnt_off0000e3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CC 17496 bytes
SHA-256: 486d870eb529501bfafca008be1212b3e1df56331c10e60c3a60f8e52b5d16e2
font_02_sfnt_off00011101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11101 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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