Malicious PDF — malware analysis report

Static analysis result for SHA-256 650c7b6938ef854a…

MALICIOUS

PDF

85.6 KB Created: 2021-09-17 21:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 501094b43d9c032c327e77f28e579907 SHA-1: 585d3684baa53016ffc8695ef87b0c1a75182247 SHA-256: 650c7b6938ef854a17fae5399f67d2a95937fa9ef4b0a9fa185ae926ba234fd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://archism.ru/uplcv?utm_term=best+tv+shows+2020 PDF link annotation
    • http://castrolmintabolt.hu/images/upload/file/22650362605.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/99898840924.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/66616961257.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/adc99c5ce97224d939995faa488c53e7/79551799496.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/tenarejobarorari.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/9676018975.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/17661446769.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/75164437173.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/jamakebukefamibewaba.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/46357162973.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/14330096083.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/jafen.pdfIn PDF document text
    • http://itena.si/uporabnik/file/seluremepukiniw.pdfIn PDF document text
    • http://iknow.pl/files/file/80645803473.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/xiwesizupekajaxipito.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/lupekijobosum.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/wofumerokevuzogojazirino.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/93f47e1bc5f0bc9f75d98c2f1fbb2b6a/91180642775.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/pepimaro.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/96999343950.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/83842853401.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140393b83333---kebovujepapuxoduwosax.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/23135857889.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/58116396065.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/71917331815.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/1de56d28bfce278f70483815084aa0d1/51111023260.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/52865153625.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_off0000ea4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4D 10148 bytes
SHA-256: a155428dc26c6eb0141da0290a181bc33269b1273e34ece0e10d32028a66676e
font_01_sfnt_off00010148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10148 18172 bytes
SHA-256: f2d8892bfebee8e9bb1b0478bcf3cd1c80a4cf2cbebef746003b864241591b3f
font_02_sfnt_off0001307d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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