PDF malware analysis — malicious · d98fc5d9ca8949f5

MALICIOUS

PDF

75.0 KB Created: 2021-09-02 09:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 5dd7536378790dc0ae3b12b8e4436471 SHA-1: 1c56c9834f082a471c6625922ff28c33933c9a6a SHA-256: d98fc5d9ca8949f585d2ff4f62b4495d456b3daab048b5f7d994dbf2673e704f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised CMS upload directories or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=spanish+for+to+be PDF link annotation
- http://zsdbiopharm.com/upload/files/65834869186.pdfIn PDF document text
- http://sbnjl.com/userfiles/files/pesokolen.pdfIn PDF document text
- http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611ddf066e3d4---tuwuruputobojasewiwuvefo.pdfIn PDF document text
- https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/2rb6njlke0n9n9btv7nu9khvgb/16441303707.pdfIn PDF document text
- https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609107b25f94e---96603779115.pdfIn PDF document text
- https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160d8dc32995e0---63953991951.pdfIn PDF document text
- http://turnyras.lt/Files/file/90833295912.pdfIn PDF document text
- https://promise-land.com/upload/file/kuvamuwesuzuduzel.pdfIn PDF document text
- https://sunrise-photon.com/upfiles/editor/files/kaladajefozamovire.pdfIn PDF document text
- https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2be1c910d---movizivofeliruragilulopu.pdfIn PDF document text
- https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf6c06bac2---51992888703.pdfIn PDF document text
- https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/3upi7ueqasinqvgq6jjm1qcrq2/pegunobobefotawaxusoni.pdfIn PDF document text
- https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073662323781---84169511906.pdfIn PDF document text
- https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/0307qltcmglm9e10b52rl5md35/vopozidodote.pdfIn PDF document text
- https://rkdestate.com/userfiles/file/9866249918.pdfIn PDF document text
- http://devison-matras.com/upload/file/kanipipuruzob.pdfIn PDF document text
- https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088448556751---rixifudanipozifatega.pdfIn PDF document text
- https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/256fec92084147a2110d03a8331bf4c1/siziw.pdfIn PDF document text
- https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/fdfa7e764a3e1144618c9c420f40b22f/kawofalebozu.pdfIn PDF document text
- http://residencelesaline.it/userfiles/files/nekeja.pdfIn PDF document text
- https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/56995a3dbacaae85347d896e690edbea/kagab.pdfIn PDF document text
- https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/14c61d3d7fb29b6b2bc50da2c0c77f24/senabarafusofisakogirerem.pdfIn PDF document text
- https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/0f19f0e75842d2b44e0ca7a84f688a69/zewozukowajemudaponolonuw.pdfIn PDF document text
- http://kleiberit.ru/files/file/30894315256.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_off0000c19e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC19E	17448 bytes
SHA-256: `a39d6ab1a23ab4762398d20f217571335743ef0927b3ae2a7408811d75999626`
`font_01_sfnt_off0000ee83.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE83	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001069a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1069A	10624 bytes
SHA-256: `85f5f08a9de8ee7707dc7ff8f0b1f9016caf4e71a57a305f8f84ad2e70b234ec`

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