Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1aef77af815546…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 01:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 03eed7c6a1ac00c3c30d87e569444e57 SHA-1: 3b61e85a1959d43ad40b1fd1c3eef8ea4ed956ff SHA-256: 9f1aef77af815546ca24a078d09a0d82fc002a28983a08cf86ccc5a195b5359f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are indicative of a phishing campaign, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://drafthe.ru/uplcv?utm_term=conscientiousness+definition+pdf PDF link annotation
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/dqrlsdrgpovld7ppto1tgvp1lr/rexewen.pdfIn PDF document text
    • http://tion.hu/upload/file/woxonilaxi.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161273bffb22a9---58476849712.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210826064418127218626.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/zimame.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/pekatexexima.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609836db3c93b---80403676628.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/vatamifojurolirodi.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/46415639921.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/dafababu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608266f61a333---71002536521.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/12606a6cf74c78bf98477ff26401d084/37743429291.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/ad48c785af20bc357a883446e865cdcb/78145566363.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///60986500200.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/zetinorekemapeziz.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094baee2e206---38570869308.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/libugojazolix.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dff97b9a3f6---80757103859.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/xelurosuvuno.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915aca20bb8---zalonoribam.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/wumat.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/444a054334180017fb2d2fc446407f42/15808769159.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/15693063887.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/wuvafuniles.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/77494508968.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d157e3ed8---sowabisirudomipilutiro.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_off0000d085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE897 21280 bytes
SHA-256: dc9003f95109004d27afee38150182a094e33ba48e57eaabff3920004ac75d0a
font_02_sfnt_off00011fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD7 10436 bytes
SHA-256: c20ab7db886512c205ef6e60f71ee0f7fcf9a70aedfced42134b35b36bc223f1

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