PDF malware analysis — malicious · 88c3b000387adb52

MALICIOUS

PDF

82.5 KB Created: 2021-09-04 03:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 20174838a9dfeff5506e46d6fa690a1c SHA-1: cab58afd50a61f90cb85886114cfb2004458e243 SHA-256: 88c3b000387adb52b813ef80e58eb062b95e7cfc3b9333176ea1621f01bea364

146 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious. The SE_CALLBACK_LURE heuristic indicates the document's content is designed to prompt the user to make a phone call, a common tactic in tech support scams or billing fraud. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it may exploit vulnerabilities or lead to further malicious content, aligning with exploitation techniques.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/22573a53a7ba767cda2abeb55c98ffa5/28806882005.pdf PDF link annotation
- http://brandweeramsterdamamstellanden.nl/userfiles/file/35927272300.pdfIn PDF document text
- https://ebooksweb.net/files/file/93694426150.pdfIn PDF document text
- http://evrofurnitura.by/elax-furnitura.ru/uploads/files/kujukapukewuzajepovopaduz.pdfIn PDF document text
- https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d65f70f5de---83008329207.pdfIn PDF document text
- http://galantemontagnana.it/ckfinder/userfiles/files/turinotuvetenifusivutuma.pdfIn PDF document text
- http://j1medical.com/uploaded/file/tital.pdfIn PDF document text
- http://esipro.fr/userfiles/file/figoseretexosi.pdfIn PDF document text
- https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8dc5cfb0e---18903898291.pdfIn PDF document text
- http://99hospitalitygroup.com/ckfinder/userfiles/files/48125070872.pdfIn PDF document text
- http://tjsijiqing.com/ckfinder/userfiles/files/2021/0530/b56b6bfe65318126bedabae2d6de1bfc.pdfIn PDF document text
- https://homeuu.biz/upload/ckeditor/pages/files/20079621456.pdfIn PDF document text
- https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612696d0dd0c3---nuxepure.pdfIn PDF document text
- https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7be31e7112---57127285134.pdfIn PDF document text
- https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e04740143f---37304843794.pdfIn PDF document text
- https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a09a1f8f---seluziko.pdfIn PDF document text
- http://woori-tour.kr/FileData/ckfinder/files/20210614_1780B75A9A8FC2EC.pdfIn PDF document text
- https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/d5e33a0599fab4baf21962e54afab76f/53488164309.pdfIn PDF document text
- https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4413644ba---11706293406.pdfIn PDF document text
- https://aczv.fr/userfiles/file/nonegebapi.pdfIn PDF document text
- https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607127d471852---podozajunekafonobefozaw.pdfIn PDF document text
- http://kondicionery-ivanteevka.ru/upload_picture/file/voxafex.pdfIn PDF document text
- http://niestachow.pl/data/aktualnosci_imgs/file/51824126598.pdfIn PDF document text
- http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d3b13633feb36a431e4261ba7811e845/6104208202.pdfIn PDF document text
- http://kcde.kr/userfiles/file/4322855671.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dc04.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC04	17988 bytes
SHA-256: `0c5752aabfc3ad999853101a0bc723fb9dbc41f67106d0a77f16b7762d59cfdb`
`font_01_sfnt_off00010a99.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A99	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000122b0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122B0	11172 bytes
SHA-256: `1ab1efa62ec11640914b3cbbf84bf72916bf7308dabd9f1e3845cc4c9ca2ee15`

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