Malicious PDF — malware analysis report

Static analysis result for SHA-256 a887591fad7068ba…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 05:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b744faf88476260bc484a6b931a1bbb6 SHA-1: 46f93dbf4dae9066a5347367c0be18a1fd00b6f6 SHA-256: a887591fad7068ba47aef07391a4fcd3e950471bae6022873277620a94a859ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and the presence of external URI heuristics further support its role as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://textolinguisticsolutions.com/upload/editor/file/11479797438.pdf In PDF document text
    • http://1959blackshirts.com/clients/866684/File/61420067123.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16126aedf6fc9b---mepakekijejugunizikuju.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2a38dbe8---ritivo.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/qgn2urplmaoseitn9kamdg1dta/38173659791.pdfIn PDF document text
    • http://industrialdevices.in/uploads/javuvepobunusudulel.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/48543484018.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/luwowijafen.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/gitureze.pdfIn PDF document text
    • https://dhesient.com/media/lapokanixuxobim.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5306aa9fd---gobone.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/46726a3b935758a2bb89a29aade31e8e/73790518404.pdfIn PDF document text
    • https://arerp.kr/data/file///42860672184.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/zenerebupasusolekimij.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/salerasusumebovasipexipu.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/vusoraferifurigisotupam.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/87501033313.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/pbbf3kb3fj24clal0egskqfbcr/xajopujitevufirolabetugo.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/pugedotosajoda.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f15ca43fd---zebasojelawus.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d959226188a2997b5cf8b1e1f94a1017/44288612492.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/posokikaxuzurusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=caramelized+onions+for+steakPDF link annotation
    • 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_off0000df28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF28 10696 bytes
SHA-256: 6a1f60c0fd8be0911fb1f6bae03af178c0ab5495666b8be1116694a776113bb4
font_01_sfnt_off0000f7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCF 19068 bytes
SHA-256: 0daabb9c52073393d5d09de4ea3cb9bca3992d54b6ea656130067820dc0a63bc

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