PDF malware analysis — malicious · bb1b5fc268109fb2

MALICIOUS

PDF

79.0 KB Created: 2021-09-06 02:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 61a21cac0a85f9d143433d08d7f1a538 SHA-1: 815b9caa63e5b0e83120e4bc17b85c32e610def3 SHA-256: bb1b5fc268109fb2c858b9a939bc807466377b553475898fb60cf072a4155fbc

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9968

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://irlanc.ru/uplcv?utm_term=addition+and+subtraction+worksheets+grade+5 PDF link annotation
- https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/d2f582637efeea0cc729a13b59e9523e/99931897007.pdfIn PDF document text
- https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/zaledatiwaduzus.pdfIn PDF document text
- https://vpntraffic.com/upload/files/nifulajasumabeloriwiteser.pdfIn PDF document text
- https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/ab271d5a2822bc5df6c1a3a9b31501e8/44699690346.pdfIn PDF document text
- https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/64c754275f4a54e81fdef1712beef7ad/3969573392.pdfIn PDF document text
- https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/74f1ad8db4a61b1519203d10bc2ac9db/44741842736.pdfIn PDF document text
- https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/88b4cce6d6d7890da5196c6d196db0d9/69971879478.pdfIn PDF document text
- https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160861b9aa2bfb---kiwijomulaxivig.pdfIn PDF document text
- https://andrejc.si/files/file/34638684562.pdfIn PDF document text
- https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ffcd98508257bc22b06dbd3ebbb78a2b/3271159424.pdfIn PDF document text
- https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e7e06bc10---46759913745.pdfIn PDF document text
- http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/32746107363.pdfIn PDF document text
- http://gabortech.comadmin/file/nunulasijisatenurab.pdfIn PDF document text
- https://borgopitti.it/userfiles/file/9004536940.pdfIn PDF document text
- http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c4f56a35cc7f9d22a68c98d9b0337cc4/42901073965.pdfIn PDF document text
- http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e0a29bf0c---48080367320.pdfIn PDF document text
- http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609468de890e2---88164556524.pdfIn PDF document text
- http://songhakbbq.com/uploads/files/milavezikozova.pdfIn PDF document text
- http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dce5e6d9311---bexamudipumeb.pdfIn PDF document text
- http://secoinblock.com/upload/files/bupopowadelavi.pdfIn PDF document text
- https://jagamimpi.net/contents//files/81896649005.pdfIn PDF document text
- https://stopserv.ru/files/file/69029631420.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_off0000d0a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD0A1	16984 bytes
SHA-256: `9ec4f844397d67ee6099ea60a2a68fc152f61ff6be058b3227a7159af7a37fde`
`font_01_sfnt_off0000fc7e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC7E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011495.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11495	11136 bytes
SHA-256: `a9dcfc0d5739422cf6d8c18fdb60ba3a9bb9d6cb5d95322682ec966d1867b649`

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