PDF malware analysis — malicious · 458562fc9a33f65f

MALICIOUS

PDF

93.4 KB Created: 2021-07-04 03:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 1243f1f4c4669ddf813736a343f534ce SHA-1: 2a0e82bd888e7c4a66286c9873c18364e02120cb SHA-256: 458562fc9a33f65ffbc7ebc4a40dc5edd88340b2dec298d1947cc7c54adedc0d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm hosted on compromised CMS uploads. While no executable scripts were extracted, the presence of numerous external URIs, many pointing to compromised WordPress sites, suggests an attempt to redirect users to malicious or phishing content. The PDF structure itself is heavily obfuscated, and the document body is unreadable binary data, indicating a focus on exploiting PDF vulnerabilities or embedding malicious links rather than displaying user-facing content.

Machine Learning

Nyx PDF Classifier malicious score 0.9769

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://mariellatriolo.it/public/file/lukev.pdf In PDF document text
- https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/f3f966bb8e6f2a0138c9078ae1277d56/1134036439.pdfIn PDF document text
- https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/20045f8619a0a4e7c5df58f487eda96c/suroviduxo.pdfIn PDF document text
- https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/b6608e5f0cc73106023af1ffeecb8288/tixuwegariwanuwoxogilezu.pdfIn PDF document text
- http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608aca5315701---19507842071.pdfIn PDF document text
- https://room12shio4.com/contents//files/nanoguxapuwurikuvanokujad.pdfIn PDF document text
- http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726d399f37a---59722925713.pdfIn PDF document text
- http://www.chatanakonci.cz/userfiles/file/7847163438.pdfIn PDF document text
- http://gsemilia.it/userfiles/files/supese.pdfIn PDF document text
- http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b899ecd36b6---wowudij.pdfIn PDF document text
- http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ns82dlk73lehvnqdqofkpuuc12/42898912215.pdfIn PDF document text
- https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/mejrib40bkltr9qvn6c70su89h/66215919248.pdfIn PDF document text
- http://musorcentrum.hu/files/article/file/43633541176.pdfIn PDF document text
- https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/7b8945800306df7d1221ee582bdb4d02/sudimizipogutogawako.pdfIn PDF document text
- https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/15503afc588f11d68daacd597ad2a404/diweg.pdfIn PDF document text
- https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/0bf716d764c28ab7999adcb615a6c44b/sumejurafirif.pdfIn PDF document text
- http://dush-kz.ru/uploads/fck/file/25735451977.pdfIn PDF document text
- https://micast.de/wp-content/plugins/super-forms/uploads/php/files/gmbeteke2medt6her9264hrr6u/jodunabokuvunofisik.pdfIn PDF document text
- http://dolphinegypt.net/userfiles/file/3329001919.pdfIn PDF document text
- http://mientaytourist.com/uploads/files/nerubijox.pdfIn PDF document text
- https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c1869687647---12113189406.pdfIn PDF document text
- http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/23316927493.pdfIn PDF document text
- http://ural-resyrs.ru/data/file/61590718953.pdfIn PDF document text
- http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d5d4f0503---54708582156.pdfIn PDF document text
- https://bdcomunicazione.it/file/53933116005.pdfIn PDF document text
- http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c1481334072---6637482044.pdfIn PDF document text
- http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f449eadbe---sujogifadutazilipulug.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+save+smaller+pdf+file+in+illustratorPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f224.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF224	16092 bytes
SHA-256: `9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd`
`font_01_sfnt_off00010769.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10769	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011f7b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F7B	17676 bytes
SHA-256: `30d7f965d41739e73ffbc1d1042d65f835acf628fe905b8c953684b6fd6d740c`
`font_03_sfnt_off00014df8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14DF8	10900 bytes
SHA-256: `97bf3369ade634bc584d74351a20f822890ee1a80ddaf1542dda0ecfe3ce78d8`

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