PDF malware analysis — malicious · 5fa1af7e251599b2

MALICIOUS

PDF

85.1 KB Created: 2021-09-07 10:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: df1d0c2075052f4276b24b357c6ae47d SHA-1: a152ab3880e10b714be5773528b96606572bc418 SHA-256: 5fa1af7e251599b288070dc1cdf45fa0fd74102d72c772c7325892434d2dd0eb

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0c0e16ca6---57138186865.pdf In PDF document text
- https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/1ff8a2cc1efd741e9eeb07880960656d/nuzoxurikoribo.pdfIn PDF document text
- http://alpinedelhi.com/userfiles/files/kepefusuxonop.pdfIn PDF document text
- http://hurtowniagrafit.pl/userfiles/file/96150793001.pdfIn PDF document text
- https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/d2e74c5207175b59468beb98c2a1a582/82102881447.pdfIn PDF document text
- http://americanewbie.com/userfiles/file/99526213238.pdfIn PDF document text
- https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/8dtkde1eucjf0bqlcc9ikp69g1/47329127674.pdfIn PDF document text
- http://tinhdaurosa.com/Images_upload/files/risomifalameweve.pdfIn PDF document text
- https://arnetbilgisayar.com/upload/ckfinder/files/70394290350.pdfIn PDF document text
- http://travellightnepal.com/userfiles/file/zevetuburit.pdfIn PDF document text
- http://theofficefurniturestore.com/ckfinder/userfiles/files/50394804998.pdfIn PDF document text
- https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eb1cb8ae05827ccb4ab974717a674a32/goxalipalat.pdfIn PDF document text
- https://fiberglasssupplydepot.com/userfiles/files/53587941387.pdfIn PDF document text
- http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/zudokejevajixewugubenawix.pdfIn PDF document text
- https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/efac134ab2af855b30f1e7be8c7eb80f/71224715083.pdfIn PDF document text
- http://staceyasp.com/UserFiles/file/14007527246.pdfIn PDF document text
- https://nwdglobal.com/ckfinder/userfiles/files/9426083040.pdfIn PDF document text
- http://artecgroupservices.com/imagenes/file/30942816605.pdfIn PDF document text
- http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb75358f89---39595095587.pdfIn PDF document text
- https://elminhaj.org/userfiles/file/wabunadowuginufod.pdfIn PDF document text
- http://hbleg.com/admin/userfiles/files/91987015186.pdfIn PDF document text
- http://hiace-yoshikawa.com/js/upload/files/61708805441.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/eca78c6c97390825db67a0023d0e55c7/zinapavifepiveluvubovezux.pdfIn PDF document text
- http://fluellentrees.com/clients/58222/File/gakim.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=shell+energy+outlook+2019+pdfPDF 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_off0000e426.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE426	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fc38.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC38	18728 bytes
SHA-256: `807d040e5558e544ca93b5e83c97ad8236daa0a78f214e10e63934d58425d935`
`font_02_sfnt_off00012c81.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C81	11196 bytes
SHA-256: `851f7b60228005d958d1f6a883b2b0f12ea8c101d6df307631b8c16fb84a2f91`

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