Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8cfc65bd8295d1…

MALICIOUS

PDF

84.8 KB Created: 2021-09-18 10:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e51e617bb486b9006a6ce883c05b648d SHA-1: f300b56ab18c10d355ee7d3bc742161d126cdf24 SHA-256: 0f8cfc65bd8295d1b23242c4b43604ab6e7c804868c2bf3d2d41a5d9faca9259
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=how+to+create+custom+textview+in+android PDF link annotation
    • http://boki.hu/editor_up/kenurigutimoziliduv.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/10345755911.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/38474215499.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141fce15c39b---nimer.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/lalivere.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210911114608.pdfIn PDF document text
    • https://braus.uz/images/shared/file/79827730325.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/siwuma.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/4232132571.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/95aafc2d2fffe76a0a3a510485fbbac6/31212084573.pdfIn PDF document text
    • http://odumakus.com/uploads/files/lixozameda.pdfIn PDF document text
    • https://dintek.eu/uploads/file/tatubadixurasi.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/xagetufulaga.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/95907816190.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/13322084036.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/27240163765.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/54909467821.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-04-05-09-02-31.pdfIn PDF document text
    • http://kaies.cn/upfiles/210901100719643245mobhmy.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/kifusozokudil.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/95426024965.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/431fc165b7bec7a012ebe5aee7160428/88777886377.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/gegivinatugewul.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/xexaroboni.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_off0000dff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF1 19700 bytes
SHA-256: 7ce9c0563a2ed0f957f16b3d7903d12f6d2afe7f4252b412286620cc23b3b690
font_01_sfnt_off0001146e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146E 10832 bytes
SHA-256: fdca8783cceac842350d93d2c874278382da7e6f670889a8e61e8647fa099f21
font_02_sfnt_off00012d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1