Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73fea2e7d1548b9…

MALICIOUS

PDF

78.1 KB Created: 2021-10-10 00:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8f91d3350b3ca33cff61f8ad144d7637 SHA-1: 7155d359aa5349986ea6aee23aedd37c36eee741 SHA-256: e73fea2e7d1548b9200b2d0a9dd82b54572cf255c639258dcc8cc5420ccd9845
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malware or engage in SEO abuse. The presence of external URI findings and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://huntic.ru/uplcv?utm_term=anoxic+encephalopathy+causes PDF link annotation
    • https://fotokeramika.bg/userfiles/file/woleduzidutarimoxib.pdfIn PDF document text
    • https://esz.jp/img/editor/files/33655969563.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/6fffe069064ced7f90c9c0e890728fe0/resobuw.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee92df4011---88763286079.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614427b91c675---duxotimelarorofe.pdfIn PDF document text
    • https://naukriguru.com/php/uploads/file/37243835760.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/sazadiledokizaxifekej.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210905055653.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/virosakuredezafufasudosim.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/81432287087.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/6902669264.pdfIn PDF document text
    • http://www.moyekolodin.com/files/gozinarufeziketi.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615f4efd3d8b1---38677980995.pdfIn PDF document text
    • https://irrisyst.eu/files/file/wuxolipakigimuvevoratesoz.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161600c2297797---muzodu.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/boluval.pdfIn PDF document text
    • https://fishuntpesca.it/file/jovamoxadoxakotizetoli.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9c1048c8f---kolakabogimurefogoketu.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311390b115f---revawiroxudesojafiwe.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/regaxafumadefokejeza.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/pakus.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/92295332568.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_off0000ce52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE664 17104 bytes
SHA-256: 5871a062227764c724f2c5e505c169b789b6be36e6f2bcf7c002f43517f4fa4a
font_02_sfnt_off0001123e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123E 10668 bytes
SHA-256: 7e1d2a9e02af6a8fcae05d940e8df1edc4c519d63ac795ebadd2bef3b631278f

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