Malicious PDF — malware analysis report

Static analysis result for SHA-256 644e175b85ed2b79…

MALICIOUS

PDF

113.9 KB Created: 2021-09-17 08:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef5b26c872494375cf197519284baada SHA-1: b14a55931be609f467ce2cd83600e60f49fe37e1 SHA-256: 644e175b85ed2b79160589d0ea265fd5937bd290b1cd33a8c26fcc36bfb3877b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised websites, many of which host other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or phish for information. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://inwebjor.ru/uplcv?utm_term=my+photo+phone+dialer+phone+dialer+contacts PDF link annotation
    • https://justforjetscatering.com/userfiles/image/files/21188468338.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/16728706071.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/c91fde2b4affda1dec5e5d0d99707acc/gugox.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/f8c10e3e84181e4eaa7de755c6546fe9/vamatigukaxima.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/86799385805.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/fopapuxegazedomad.pdfIn PDF document text
    • http://newworldss.com/uploads/file/pofuwubil.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/nubek.pdfIn PDF document text
    • https://veneziashowroom.ro/app/webroot/files/userfiles/files/9580948765.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/0fbtsk72pfm1ipnnmte8quj6os/95005982973.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614041d68602f---74384963851.pdfIn PDF document text
    • https://khanikango.in/file/zuwalufagamunoguror.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/lisazoxemoref.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b198bb938---pufawitotunubevapipe.pdfIn PDF document text
    • http://gabortech.com/admin/file/paxemasuboporup.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///69400144235.pdfIn PDF document text
    • http://eva.am/files/8a7982b49d013946.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/77784513959.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/tamejovunikujulujo.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/wazaxolatoronosawaf.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a699878fc9---remogudegopirazutabora.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/5119971374.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/jugawofabilemotizefe.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_off00015711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15711 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F28 10716 bytes
SHA-256: 3aa8bb0aaf187b808daafe12236d22acc5bb94778d6153e952ce00b6b5e17191
font_02_sfnt_off000187b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187B2 19236 bytes
SHA-256: 430b6bd274667510b96cb8a31a5b7be4575892d114c2be8d466419b47b2584a2

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