Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec22b80895f9b1b7…

MALICIOUS

PDF

73.2 KB Created: 2021-09-16 06:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4a83f35b77ee81518a936698d67177a2 SHA-1: 649fcdd72103559b530e4961cbb8e703201d395d SHA-256: ec22b80895f9b1b7061417e5a5054ac8a8d69688c23878a57e05fe7f0fcf13b3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised content delivery or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests the primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=top+gear+season+9+episode+1 PDF link annotation
    • http://fasson.vip/images/editor/files/sigalatufa.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/lejisebibibofiletave.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/nujerapesazarazojat.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/96034166472.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/35518667082.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/84135520815.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/66727221002.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/jojatoritasuwefugati.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/95389974930.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/nagibitafiwopafabiwones.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/faxodepovego.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340e7f8a85c---gejaviwewibilalagevuteto.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/92807822971.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109061609596187.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f80d50f8b0---rarafuwa.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/90566299748.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/lirumafetexuf.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/69978279187.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/jujekajamomedaxesesemozon.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/ladawunigetasum.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/tifet.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/jajarolovedoro.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613996af84e7e---gotasazolafek.pdfIn PDF document text
    • https://questyme.com/userfiles/file/tezanimugef.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/70445860588.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_off0000bc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC31 16620 bytes
SHA-256: 452e7ec72aeebc2b371b568e327c872cd0fd3cc9f04cff4156ed0ee4098e87f8
font_01_sfnt_off0000e70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70C 10604 bytes
SHA-256: 2c744d6a7ba927ed5086520663cfb15be1f5ce60d323b29d6d820547aa6c785c
font_02_sfnt_off0000ff3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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