PDF malware analysis — malicious · 68944d166a2f0f79

MALICIOUS

PDF

87.7 KB Created: 2021-06-25 19:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 855dfdbd2028040563352a1bcf492689 SHA-1: ef1552a50f5ea5f888f302191cb14994db210da2 SHA-256: 68944d166a2f0f79a12f65359ae4faa31331adca956e391fd767cd3562b2d418

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. Although no scripts were directly extracted, the PDF structure and embedded URLs strongly imply an attempt to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160acef27735d6---ginotosoxi.pdf In PDF document text
- http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/vjacdc7nvj1i3105pge25mn9r3/xebezepusulitedosoti.pdfIn PDF document text
- http://automotiveenergy.cz/userfiles/file/56050707610.pdfIn PDF document text
- http://zabradli-znerezu.cz/userfiles/file/23353212660.pdfIn PDF document text
- http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/kedigibejil.pdfIn PDF document text
- http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b378893c8a7---novaputuremixogu.pdfIn PDF document text
- http://toshiteriyakiburien.com/uploads/files/davarumajuduzonikutate.pdfIn PDF document text
- https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/nphc3vv396sn0hao50eqmran56/47732130790.pdfIn PDF document text
- http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075767e8d40e---kikuzupagaxipelebunoxaz.pdfIn PDF document text
- http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e0de8574a---faxikijedigoxase.pdfIn PDF document text
- http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/7627357236.pdfIn PDF document text
- https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/0f2ccb03ad99a895d76fbe00309a3bf4/19986223293.pdfIn PDF document text
- https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/4c9a9e261bb464f6f73a68c6e2e85dfa/92500390524.pdfIn PDF document text
- https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/66fd060d11d9866ef87b0cc5b4785622/25133907825.pdfIn PDF document text
- http://divorcefinance.nl/uploads//file/56295701833.pdfIn PDF document text
- http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf939233dab---lezifodovanawewesurazotuz.pdfIn PDF document text
- http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16086077052144---1110330363.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b122c9018a5.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c944fd2974c---zixijilimoba.pdfIn PDF document text
- https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c49db7467ea---4702821525.pdfIn PDF document text
- https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85079dfc61---sisagonunewozugomu.pdfIn PDF document text
- http://rudolphalexander.com/uploads/files/zozupetanaselujekalinidum.pdfIn PDF document text
- http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609e97601a13d---rinisadawagenefeze.pdfIn PDF document text
- https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/tf0miqpi6hltoon0dcq3maomq5/tirapasubidibufezuw.pdfIn PDF document text
- https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/tr3g3egfqj6ncbd9uthkjuud7m/76174925299.pdfIn PDF document text
- http://dges.in/userfiles/file/miwuxekigofoxubanojunifo.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=compare+and+contrast+potential+and+kinetic+energyPDF 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_off0000f2bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2BB	17328 bytes
SHA-256: `175c16fdcb0dc4a60d46c12aec553a9f04baa90ed06206e020a53aa42dcaa9b6`
`font_01_sfnt_off00011f2e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F2E	11092 bytes
SHA-256: `63bd11a1443144de7f7ac0d198980ce7183cc95a3859df9ab2ff3e3721c213c8`
`font_02_sfnt_off000138db.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x138DB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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