PDF malware analysis — malicious · 45d80cb530ee4183

MALICIOUS

PDF

76.0 KB Created: 2021-06-27 22:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 5f4cfd6f4dfc6881c8b9793c9cbfee86 SHA-1: d829d24ee619104f08cd505393a9d8975531f253 SHA-256: 45d80cb530ee4183c329c5622cf87fec693948ba9a677b3f590b7f2d48bc4cc0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and compromised CMS upload links further supports this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9827

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://medvor.ru/uplcv?utm_term=bad+guy+fingerstyle PDF link annotation
- http://coumert.com/images/file/zodetabitorovunufaveveva.pdfIn PDF document text
- https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160d32bec70d15---tosel.pdfIn PDF document text
- http://jrmhandling.nl/upload/file/kariti.pdfIn PDF document text
- http://podushka.by/files/files/90471241700.pdfIn PDF document text
- http://mariekevanvlierden.nl/survey/userfiles/files/wogabupajifozar.pdfIn PDF document text
- https://ildiko-szepsegszalon.hu/userfiles/file/fosiwuwurareliroxoxe.pdfIn PDF document text
- http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a2a370bc2---42111752456.pdfIn PDF document text
- https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/og3js76uda8757l25s6qe06ae7/1957968026.pdfIn PDF document text
- http://emotionpicturesfestival.gr/userfiles/file/juvikod.pdfIn PDF document text
- https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acf06b6f5f4---jixumarutipe.pdfIn PDF document text
- http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bac25884823---julanemelekijex.pdfIn PDF document text
- https://golf-tout-terrain.com/publish/page/file/1637063242.pdfIn PDF document text
- https://astek-telem.fr/userfiles/file/89404925764.pdfIn PDF document text
- http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd1b80e131---guvezizutagu.pdfIn PDF document text
- http://amandatravel.com/userfiles/file/dazufudodipebatubure.pdfIn PDF document text
- https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d97eb1bb44---suluwodom.pdfIn PDF document text
- http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c09e59093ec---13436209716.pdfIn PDF document text
- http://asustainable.com/global/file/favuxuso.pdfIn PDF document text
- http://krukewittfarms.com/userfiles/file/14555759167.pdfIn PDF document text
- https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/3d4d1e4b422d4aa1bfd1f13600907fc7/wajirinidosabi.pdfIn PDF document text
- http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16077da7ab9567---46256315817.pdfIn PDF document text
- https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/qhjdtccifjj4k8tmgroknldog3/37062455221.pdfIn PDF document text
- http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160864ba88f970---61617094236.pdfIn PDF document text
- http://fxmeat.com/upload/file/cc18b42650bfbf389e86930bdd8dee26.pdfIn PDF document text
- http://infinijewelry.com/userfiles/file/xebasunosonazefon.pdfIn PDF document text
- https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/e4vjqvof6j0o0pvkgb7id9j87n/zebofewilebiguxekazozaw.pdfIn PDF document text
- http://abwplazaview.com/uploads/files/1758663859.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_off0000c479.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC479	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dc8b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC8B	17948 bytes
SHA-256: `f0d129c4ac8a0fc0fb3d0c61f6535061a194bf90023fa230a552dbbe883037ff`
`font_02_sfnt_off00010a50.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A50	10676 bytes
SHA-256: `98655b4beeba995f8e8adadb6c99736edadd4d805920e88395ad510220134adb`

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