PDF malware analysis — malicious · 99880f1869b999a3

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 21:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 04bfeb9c21caa093c2c32bf31579fe26 SHA-1: 14f07a183c004abc00e1aebeb1b8db8b96d69849 SHA-256: 99880f1869b999a34be7cb4bd9c1d06b4bceac1abe0ad58df46bd6bf55a374dc

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for initiating malicious actions. Heuristics indicate it functions as a link farm, directing users to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/967621437b46e0052baf6ca352771383/biges.pdf In PDF document text
- https://textolinguisticsolutions.com/upload/editor/file/goxoda.pdfIn PDF document text
- http://wellfoto.cz/pictures/files/pexafofokevum.pdfIn PDF document text
- http://mojahotels.com/ckfinder/userfiles/files/29233200081.pdfIn PDF document text
- http://phuocthuan.vn/images/pic/file/ruxejazafejebir.pdfIn PDF document text
- https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/0h1dl5uhtgiia096ugledlv9lt/zinimosoxewoxepupipaxikux.pdfIn PDF document text
- http://avatars.ru/userfiles/file/wolugu.pdfIn PDF document text
- https://budgetparking.ca/admin/uploads/file/273054247.pdfIn PDF document text
- http://georgeandmaryjones.com/clients/f/ff/ff66b05efb8f16ea353d8e6908bb1429/File/gosutilewowiga.pdfIn PDF document text
- http://atonoserver.com/userfiles/file/bafoke.pdfIn PDF document text
- http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe68cc367a---rozuzoranekakuzixojovab.pdfIn PDF document text
- https://fisheaglesafaris.net/pics/user/file/majumazofezekepukitudi.pdfIn PDF document text
- https://fl-forever.com/upfiles/editor/files/61863657724.pdfIn PDF document text
- http://55pluscommunityspecialist.com/userfiles/files/76228209994.pdfIn PDF document text
- http://gasnguyenanhst.com/js/ckfinder/userfiles/files/80925502931.pdfIn PDF document text
- http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kadovagu.pdfIn PDF document text
- https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ao5sb8v958fnpcg4r6dg9dp16i/76425892495.pdfIn PDF document text
- http://bacvietexpress.com/upload/userfiles/files/12790112493.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f858272c3---47175124250.pdfIn PDF document text
- http://adabaskimerkezi.com/upload/file/35813036635.pdfIn PDF document text
- https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/160821c5b46dae---rukafibosesironure.pdfIn PDF document text
- http://techniq.ae/admin/uploadfiles/file/55933431104.pdfIn PDF document text
- http://portableandcool.com/files/files/vabudunekunumubipebov.pdfIn PDF document text
- http://seeandhearbetter.ie/img/shop//contents/35879484386.pdfIn PDF document text
- https://fontan-montag.ru/img/upload/1745906398.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=2008+toyota+sequoia+owners+manual+pdfPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d907.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD907	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f11e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF11E	11460 bytes
SHA-256: `65325d1474b7b355a385aaaebec68e892f202768c3611dfb15db025e3ad4997e`
`font_02_sfnt_off00010c1b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C1B	17468 bytes
SHA-256: `3ce214858272bd14f9fedfa02691b29c1819590f6f9d15532aa017ca7ec834da`

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