Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c798bd1491b6518…

MALICIOUS

PDF

75.7 KB Created: 2021-09-10 19:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 75455ede3d4ef1521cf275f65589942f SHA-1: e522bde1faf9e4c261aa8504cddd498965b9104f SHA-256: 1c798bd1491b65182c8a750e98d4d39921ffac9a0053792990c6fd07bb7d18e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

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 http://alfadent-volg.ru/images_uploads/files/zoxibunoxemeji.pdf In PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/bibowixobogabovinewu.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/kl73gc8i2gc0246sqgdkrmbmt6/9126879322.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/satewetefiraxake.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/9850201618.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/rujolopidi.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/41897746014.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/gopumumonigixijubap.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/nojozejabufalita.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/28992099976.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/21983267978.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/505324521612f614c4e470.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/pusibi.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/jokezetukumisuvemiwufane.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/31224486550.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/renirobe.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161348f7c2b79a---44369984104.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/sixuxefowel.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dd731719b---70117737825.pdfIn PDF document text
    • http://tchid.net/userfiles/file/tepever.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/18164416619.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/51252323921.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/furabalatufamezawakaxevav.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/30d82f2034a27036682b49fea80e4e0e/deporowenifi.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/raxavukuxozuxozilazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=flashing+software+for+androidPDF 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_off0000c4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CE 17020 bytes
SHA-256: c56cd0afd22fab56d96af213c2422d3eb88fb871d2c6ffdd1309240bbd409a11
font_01_sfnt_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 10696 bytes
SHA-256: 50d6cc40d156f582ce7d6035a3a52490e4c0fd637d12f349a1e85f6f3c6d90df