PDF malware analysis — malicious · 53b0b58858401eb6

MALICIOUS

PDF

85.8 KB Created: 2021-09-07 13:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 2fae882e3960071364c82a00d00fb70f SHA-1: dbc6d49465a80e5d9bb6f6a4195e8248b6308334 SHA-256: 53b0b58858401eb668b182c6707a8abbb7e1ae4802e2d4280d1e8617f32f9aa4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to obscure the true destination of the links. No scripts were extracted, but the presence of external URIs and the link farm structure strongly suggest a phishing or malware distribution vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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://archism.ru/uplcv?utm_term=nudge+theory+in+action+pdf PDF link annotation
- https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b907553b9a3---15867142024.pdfIn PDF document text
- http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160982e09ae94e---rakewojuwozari.pdfIn PDF document text
- http://pizzeria-millemiglia.de/app/webroot/img/editor/file/wakibojapanuluvu.pdfIn PDF document text
- http://laptopcuhaiphong.vn/upload/files/96681869730.pdfIn PDF document text
- http://reinforcingourheritage.com/clients/0/08/0860c2a235168fe7e4a745c824023bdd/File/32958008577.pdfIn PDF document text
- http://alwaysshine.com/fileimage/file/tibokotizivawakozawobe.pdfIn PDF document text
- https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/5cv1r3oqs9apm35u655n6r72er/jofakutixavajar.pdfIn PDF document text
- https://alternatifhirdavat.com/upload/ckfinder/files/xejejuzagib.pdfIn PDF document text
- https://ijp2.com/contents/files/23258153366.pdfIn PDF document text
- https://topclassgreenery.nl/images/file/93739024264.pdfIn PDF document text
- https://thaiwoodengames.com/files/upload/files/fiwidesabinelozozitoze.pdfIn PDF document text
- http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/wewowedesavigisavipez.pdfIn PDF document text
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cde1c8c9e7a---suvidajizexelevu.pdfIn PDF document text
- http://christopherspubandgrille.com/userfiles/files/fuvawarijafa.pdfIn PDF document text
- http://ty-universe.com/image/files/20210816_070722.pdfIn PDF document text
- http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161133ea83f290---47249289121.pdfIn PDF document text
- http://escalierdurire.fr/ckfinder/userfiles/files/28792927668.pdfIn PDF document text
- https://songod.vn/uploads/image/files/tilaxalejumigumuvo.pdfIn PDF document text
- https://asiastudy.in/ckfinder/userfiles/files/ledivilazagofezebo.pdfIn PDF document text
- http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/658e5965572232e1a63bd62458712de5/86570243917.pdfIn PDF document text
- https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/e9e90320d6793d3124ea4a07ea9806d7/ladifixetakuxik.pdfIn PDF document text
- https://mudraconsultancy.com/uploads/files/guresipo.pdfIn PDF document text
- https://ctsgroups.asia/images/file/lirakavonepanivogalot.pdfIn PDF document text
- http://malbreil.com/userfiles/file/dobaduxujebaguted.pdfIn PDF document text
- https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073662323781---84169511906.pdfIn PDF document text
- https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63d45c22a2---72662616900.pdfIn PDF document text
- http://abwingsde.com/uploads/files/lufisiderugipe.pdfIn PDF document text
- http://myjobcareer.net/userfiles/file/2021070322110973499.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_off0000eb53.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB53	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001036a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1036A	10876 bytes
SHA-256: `a2eae16cc00a364a2d0b576fec72185ba0866326c2d10828fbc61df5dbf8d453`
`font_02_sfnt_off00011c4c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C4C	17456 bytes
SHA-256: `f67bdbdef1dc8033aca872ece949544a54c468a5ef59bef7c996db80770bca61`

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