Malicious PDF — malware analysis report

Static analysis result for SHA-256 22782dcc4f1b9f11…

MALICIOUS

PDF

102.2 KB Created: 2021-08-09 04:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 20986b0c79e73cbf1917302de661245a SHA-1: 83c93e237f6555361dd5c9cfc7b4b0f96e239f63 SHA-256: 22782dcc4f1b9f11253f51203c936636c8e463b48826dcf5edc478b498cd5a80
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. The document contains a link farm pointing to numerous compromised websites, likely intended to redirect users to malicious content or phishing pages. No scripts were extracted, but the presence of external URIs and link farms strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=cracking+the+coding+interview+python+book PDF link annotation
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/436b10fe8eca371d8027df94193c459d/foxojamedezagoja.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16084bcf9d819a---56758255185.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607262560aa88---90600907554.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/3801f8e6d0af5086ec2861cec692c327/62205367285.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/292496e78e9c36c69f43f83c6b099344/fizajedemomarilera.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/ropovezaluxolijig.pdfIn PDF document text
    • https://www.jedeminute.de/wp-content/plugins/super-forms/uploads/php/files/qf94llqf5253rt5q71be2vnuhd/zobamuxezibugiwetewede.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/55478f463d3a9d173bd99d7081f478ba/sevesidedog.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/7bk96c5iae8rjoesv3rkevn7kq/39918157931.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/28496744320.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608fba18cdb98---dovufaxifadasi.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/7016613474.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210724_151655.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608442ee06e3c---62617322627.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/76904789697.pdfIn PDF document text
    • http://k1a.ru/images/files/file/mojuverokewofuruvanepe.pdfIn PDF document text
    • https://chptravel.ir/data/file/dilumovo.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0716402d5a---ratevomufevudadujorapaj.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62456401f---54138073111.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783f96b3ef6---35423592715.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/98590616212.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/lasusorado.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/fukegixas.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/53947685994.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/14476651855.pdfIn PDF document text
    • http://nineslash.com/user_file/file/gerasunumopas.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_off00012331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12331 11108 bytes
SHA-256: 1bbdf711abc3e82df8c441ddcb6eb3a094c8b636b3cb81dab742e0355d013ac2
font_01_sfnt_off00013caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAF 20492 bytes
SHA-256: 816a34ce3cf377a5e5f455bd5c242eb2cee66aadf1d6f840424831f42dea1c68
font_02_sfnt_off00017207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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