Malicious PDF — malware analysis report

Static analysis result for SHA-256 d491ffd2cc01d3db…

MALICIOUS

PDF

91.2 KB Created: 2021-09-05 18:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 606191f96d9c62bab72b6df2951817f9 SHA-1: 48c273dd9308035dffcefba724e7e0b44802460b SHA-256: d491ffd2cc01d3dbe691908e5373d5d944eebae2492ace9cf0f26ad0366fc808
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites, including one hosted on a WordPress upload directory. The primary URL, 'https://inwebjor.ru/uplcv?utm_term=adding+new+worksheet+excel+vba', suggests a lure related to Excel VBA, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://inwebjor.ru/uplcv?utm_term=adding+new+worksheet+excel+vba PDF link annotation
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c35811b086---73923920005.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/96716980522.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/pgaat9e6u4kav0dn5trrutevjm/72939121327.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/51520519855.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160efde9703b95---35668923055.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5713539da---12212037150.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/60585049196.pdfIn PDF document text
    • http://yjccnc.com/upload/files/tifararogazonimaguboki.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d5178262ac1---jilukivuda.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/ko190ektvh0f0htv32qs6bpv5p/vujuni.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/tajikiki.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/6ae60c6e7ef5579a2367fce6556334ae/41150805510.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/61422293426.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/61891746252.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/50497713737.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/garaluvo.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ejf53f2ihlrjcvpmdr58luogqo/38010748345.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/21951994848.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/rubesepomarugeked.pdfIn PDF document text
    • https://bagstyle.uz/images/file/99752621669.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/8166b6c4168b679d506becc507d8ba5d/dojonedo.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_off0000fc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3E 19012 bytes
SHA-256: c2f49fae9ea5b89dcb59c5a9e963aabb44c06fa934de821e07291d99f4c0d326
font_01_sfnt_off00012d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001453d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1453D 11116 bytes
SHA-256: 6e3f54244c430a3dd21dced2c95ec9aafc94217ac6b549f74f0df09f3b6d5545

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