Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd2c9bd3d7c0860…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 06:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1874ae3628074de5107189569ddf04e7 SHA-1: 5dda64444730f06c71096c4520c1a5d540e2983a SHA-256: 1bd2c9bd3d7c086076b08f7cda9d5245a348dbebbba87e18d89d0c34a0f05cb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

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://crewmak.ru/uplcv?utm_term=anestesia+raquidea+y+epidural+diferencias+pdf PDF link annotation
    • https://michelbarbot.com/upload/files/nemabutakeke.pdfIn PDF document text
    • http://vning.net/filespath/files/20210804124626.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/zadanibebeku.pdfIn PDF document text
    • http://semot.com/Store/userfiles/file/82734549951.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/155029449960f0e9e19d4d6.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/d30a2018bfb25c8b01cbf4a118275e5f/33024597975.pdfIn PDF document text
    • http://gardatrans.com/content/Files/50187294321.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/zakuxuwejif.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/c38cb858667dfe12822e9f96ff414ee4/65704478887.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/36703569871.pdfIn PDF document text
    • https://orangerun.re/photo/files/webasej.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/8077532630.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210507053048470179074.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16083c86048fca---82992614898.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/gefumalevinidotimi.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f5a7b4f00---zezez.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/68226333421.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/miwapawinixufefiv.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/faganonokumawomofoverudo.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/85868419870.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/37819309553.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/e58c296d30b0b3e0a6fd409bc9d34b40/piriwi.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/51930694978.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/3ev5p88g8o5h3ltlfvjvcdvje1/zapumajaju.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_off0000d5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 17508 bytes
SHA-256: 27fc28b2dc6e99bc823655c0caa93441dfd77104cd86a178481ed4c9c35086f6
font_02_sfnt_off00011aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA0 10836 bytes
SHA-256: 164aaafeb75560b3307b6777ef1d9a93e6f1d11c6923405f86382b9936f13f1d

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