Malicious PDF — malware analysis report

Static analysis result for SHA-256 169028049b9feefb…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 02:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b88a1716b93b32bf894358bfdf35264 SHA-1: 931844503aeda3239e64924321682be81eccb455 SHA-256: 169028049b9feefb873565d1a7b87ae3e0ce148e8fe54e65f39bd8e6830af107
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the document is intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=ntse+scholarship+form+2019+pdf PDF link annotation
    • http://richfield1960.com/clients/865265/File/45901021436.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7118f1506d---topogif.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/48215393582.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/d1ed6aa47233b1c2054e8635bbcab2c2/megegip.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/26117897727.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/a6e2d6193b615c7c0e24b48fce04b566/33513630518.pdfIn PDF document text
    • http://masonhn.com/d/files/silevidetesexiwo.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160706273cb631---dulefonijupigafewepa.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/10502900174.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838ec06d3f2---wokomajivijibamoburomaj.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/zuxoxiboledazuparenumixer.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/4934839561.pdfIn PDF document text
    • http://vitaminyplus.eu/files/file/6160502276.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749e8005a61---11424825489.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c028feaf26e---xavufibubotilu.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/32220280526.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/panexadugabanopirenimuge.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/lixopofamorovu.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/bifajiwisopanira.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/72447032428.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/46912530465.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_off0000d42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42A 17652 bytes
SHA-256: a5226bd6f74b9b747e9be8f0f283e1b547e45e8005e5c623cb71c3c862e48cc9
font_01_sfnt_off0001020f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A26 11220 bytes
SHA-256: 5d4a36bd709a8e780d856891243ebcb053dc00e4c67a4dbc6ca00144b7c9de67

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