Malicious PDF — malware analysis report

Static analysis result for SHA-256 d151f5f0f76eb859…

MALICIOUS

PDF

75.6 KB Created: 2021-09-04 09:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3b67902ede776bc55ab1ae9c80838b7f SHA-1: d9353cc8c9b921caf639fca1ed5da4b2c43b1325 SHA-256: d151f5f0f76eb8597bdddf851e3afddbc9cceb023b4d230c5b7d36d1143e00b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable domains, which is a common tactic for phishing or distributing further malware. The presence of multiple links on compromised CMS uploads and disposable hosting increases the likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://seabeachthailand.com/UserFiles/file/pijakidarajid.pdf In PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/11809018608.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/vegif.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/88240890034.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb7690e252---71545675142.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/35877855275.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/22069069897.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/kepomopenosexolarofu.pdfIn PDF document text
    • http://doer-sh.com/Uploadfiles/files/17410862151.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee1e618bbe---2689093663.pdfIn PDF document text
    • https://chptravel.ir/data/file/68720962930.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///23877010301.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/8cpoa8ueoh1chk472c2nf7r1jt/pakinoju.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/wuvudigewazewupale.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b4b9bd8bb---85760888763.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f7cb8e93a---88269563421.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c659f251428---7084043933.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/64206554665.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/53404926702.pdfIn PDF document text
    • http://mega.kz/media/upload/files/nobegofanoguxumafupim.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/60450134525.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/vimuzefidiken.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/rv0msfmkg6ur7adoihlf10dsv0/xuzitijumapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=possessive+nouns+plural+and+singular+worksheetsPDF 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_off0000c204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC204 17436 bytes
SHA-256: af8904612de030d72b396b9e347058f362294e7e8742641d38dd2b62171deaf1
font_01_sfnt_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 11016 bytes
SHA-256: 6b3dfbd313b00ce7acc510ee30d45e37f6a5dbc813540439e9fb7d603737880c
font_02_sfnt_off000108b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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