Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ad7849e109d5ee…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 13:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9a2df78927aaf9133e811c8827855d56 SHA-1: 121d5a42054c4e8a392a856dc0b07470cf48e26e SHA-256: f7ad7849e109d5eeb7426d92a95d8492d83cebf3aecd05fcb8f162f13644bab8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress sites and disposable hosting, with multiple external URIs. The presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=page+dark+mode PDF link annotation
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614924d22fcbb---vidafefizumijawakev.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/mokejuladageguvirebof.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/kizilenaba.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6188b177f---13209028626.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/xukazatuxil.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/wanareg.pdfIn PDF document text
    • http://floramarble.com/uploads/torepubezazi.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/kefofera.pdfIn PDF document text
    • http://pasaru.com/upload/files/tipit.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/6dfc2e6c644e1d1583f97a857627e4e0/purabanuniluleloxofakoxeg.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/19258681408.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/ralelev.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/52741272666.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/98461800823.pdfIn PDF document text
    • http://theponghop.com/upload/files/12140232302.pdfIn PDF document text
    • http://juentai.com/userfiles/files/33247751253.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/tidawija.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/tiworakupazavevabomogifa.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/40971397957.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/86973044862.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/zazevurumu.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/sapowabokupebikidomexe.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/e8cb7287917866658b9e8ecae058a48e/18550651112.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/32529523460.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_off0000b223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA35 15136 bytes
SHA-256: 09ba12b46b313c2270ff2e37e8619da909ccd7ec33547e6ce41f2d7f559aca46
font_02_sfnt_off0000f08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 10176 bytes
SHA-256: 6c3e86e62e98a62bb52bc135c75019b5f5d5d0a3b60ac5bef6dce8d0452239f9

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