PDF malware analysis — malicious · 0a6e483321e643ad

MALICIOUS

PDF

79.0 KB Created: 2021-06-28 05:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: a392900af80b05eff1c8fee6718b7793 SHA-1: eb7bd1358ea6230edce1573a4dc44984c14db1f2 SHA-256: 0a6e483321e643ade51a43ec8fede7e6669d4f8194930c352e2a2032b0b8e7bd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://blokhol.com/upload/files/54249950659.pdf In PDF document text
- http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2cb63af6---44039257968.pdfIn PDF document text
- https://abofahed.com/userfiles/file/binax.pdfIn PDF document text
- http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe9afa2c4c---43206203863.pdfIn PDF document text
- https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/7e495959985d6948dfdd4ceb09b2a4aa/59975330948.pdfIn PDF document text
- https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9074c00aa---kakinamoxepekav.pdfIn PDF document text
- http://alexanderkanevskyartgallery.com/clientMedia/file/68829054616.pdfIn PDF document text
- http://cukiernia-waltar.pl/qcms/userfiles/file/kolijofavo.pdfIn PDF document text
- https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/b56cd6989d50c68f01d3c69084b557d1/32187412366.pdfIn PDF document text
- http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb32232079---domafafibuf.pdfIn PDF document text
- https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/3996e8b23f785b269992c941ea11952b/3579849328.pdfIn PDF document text
- http://teplospectr.ru/images/files/lefawowevenedikozexanupa.pdfIn PDF document text
- http://www.iece.in/userfiles/file/55369006030.pdfIn PDF document text
- https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e607987e659136b72177c28d8c9e8482/sokifalixelufit.pdfIn PDF document text
- https://contabil-fiscal.ro/mm/file/13283511467.pdfIn PDF document text
- http://pileshoppen.dk/userfiles/file/sugixegusun.pdfIn PDF document text
- http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/90918554093.pdfIn PDF document text
- https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608be617e1c6d---xirujaduxujekafo.pdfIn PDF document text
- http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e09cd6716---xomapivikajupuxewetorivog.pdfIn PDF document text
- https://groupunsur4.com/contents//files/49499188051.pdfIn PDF document text
- https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/65hba3n1s73kn53csptvtcpbt3/93192869240.pdfIn PDF document text
- https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/60147d273e77afd90f2426b1a010c95e/1195404244.pdfIn PDF document text
- http://thunderstar.cn/userfiles/file/20210521220026294133907.pdfIn PDF document text
- http://assushop.com/userfiles/assushop.com/file/51239731469.pdfIn PDF document text
- https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/03e2c04644cee48b4854756562ba6df8/21044379348.pdfIn PDF document text
- http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83ac6e171f---16745189508.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=feeling+faint+after+standing+upPDF 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_off0000d646.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD646	16052 bytes
SHA-256: `4b2a05301f93ebeda445fc095bb06c31e128e85ac69329880d1ba70050b924db`
`font_01_sfnt_off0000ffb3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFB3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000117ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117CA	10632 bytes
SHA-256: `05b8164e524ea1137047d5db6c313769fa4e99fee8b3f66836b2b5622c99a87d`

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