Malicious PDF — malware analysis report

Static analysis result for SHA-256 9609b56ccbe4b1c8…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 17:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3b2497b1dfd715da4933f5a97caba0e9 SHA-1: 2083da44d5934eade39837454acb092a0d04efe2 SHA-256: 9609b56ccbe4b1c87a3905835a9102ffb5c91dc317b3f952877d948bcb4f4a0c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various domains, many of which are identified as disposable or potentially compromised, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://healthywithhart.com/res/file/mifapokelebi.pdf In PDF document text
    • http://codienlanhminhquang.com/upload/files/xulelekivaletev.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/fimuvoxuvinosuzumaweli.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/67614518295.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/859d470607fcabf9e85c6fcc13326399/vezasirudijexemofe.pdfIn PDF document text
    • https://claudiodituri.it/uploads/remolu.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/bafowagozekadotojoxu.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/56773748784.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/96374629803.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/24921977322.pdfIn PDF document text
    • http://chenruichem.com/upload/files/barapapavuru.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/17549631988.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/25956462407.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/wipotuzux.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/51295237956ffe8e55ecb0f4d3460e6c/wavabakizako.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/75447457844.pdfIn PDF document text
    • http://humanlitech.com/files/files/32280520364.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eeb60280ed---bolezomepategejonuzirufe.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/48910961602.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/96511256977.pdfIn PDF document text
    • http://scpt.it/userfiles/files/30699191864.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/33427103087.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/13129172244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=app+free+fire+apkPDF link annotation
    • 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_off0000ddd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E8 18004 bytes
SHA-256: 3bcb726ef7f69fdffbd0a60a4246e1a0bda125bb81c335c774c3f6645cbdff1a
font_02_sfnt_off000124ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CE 9888 bytes
SHA-256: a506711e305d68eae8282148971f578c28fe00adea1b02a77ce1b564085a216e

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