PDF malware analysis — malicious · 3f44a76694c3d310

MALICIOUS

PDF

83.0 KB Created: 2021-08-26 04:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 1cd08bb6718ed7242f063d485bf8496f SHA-1: 851814b18b91e540c6d8c691b016c30013ccb8d5 SHA-256: 3f44a76694c3d310e5604d8a3c0fcc8f39b2ff8410800fcaaf7b86ea3a080eee

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous links, including those on disposable hosting and utilizing UTM parameters, suggests an attempt to obscure the true malicious destination and potentially distribute malware or conduct phishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://bursac.net/userfiles/file/wimojisubeperolodiwide.pdf In PDF document text
- http://szcftz.com/upload/zapesu.pdfIn PDF document text
- http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c6985d3e1ab---xogutoniwefoxuzelu.pdfIn PDF document text
- http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114e84ae5ed8---31940185602.pdfIn PDF document text
- https://igescanada.com/ckfinder/userfiles/files/jidasafuxesusaxumozesov.pdfIn PDF document text
- https://baohohoanglong.com/userfiles/file/xejifevidoxe.pdfIn PDF document text
- http://www.verneteco.com/ckfinder/userfiles/files/pezevepafaz.pdfIn PDF document text
- https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/332f1b674c043876d113bac2a96a9762/gibosovezawu.pdfIn PDF document text
- http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef135750fa---97481689231.pdfIn PDF document text
- https://heatingboiler.ca/fck_upload/file/wubojukibifomexelu.pdfIn PDF document text
- https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/bfc5d6cd5abe955b0d5bf8caec8c7cef/kafaxaminiselomu.pdfIn PDF document text
- http://hanart21.com/files/userfiles/file/zunirogerenosikeb.pdfIn PDF document text
- http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160896e802d153---rexekojexaperipu.pdfIn PDF document text
- http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8b410618b---wozef.pdfIn PDF document text
- http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/mobafivovizozoto.pdfIn PDF document text
- http://beerskiboot.com/img/upload/file/7957929172.pdfIn PDF document text
- https://pirkitpadangas.lt/ckfinder/userfiles/files/dikiwowireloputo.pdfIn PDF document text
- http://incucinaconalberta.com/userfiles/files/70350201466.pdfIn PDF document text
- https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/r87nco1ln5l7uosdl4tk2p6a84/kadibenoluvatukufenaniv.pdfIn PDF document text
- https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea0c8b9a4c---85184744255.pdfIn PDF document text
- https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afeb82b98ea---pizabewudoxonowadigimi.pdfIn PDF document text
- https://munord.com/wp-content/plugins/super-forms/uploads/php/files/24b86fcf22e4f9e24c25ccc4ba7fa69d/pelifujalewifekepeg.pdfIn PDF document text
- http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2c1b5bf93---94501173749.pdfIn PDF document text
- http://svsteinfurth.de/radsportfiles/file/suxobumitemuripaz.pdfIn PDF document text
- http://kashima.cc/userfiles/file/11419607072.pdfIn PDF document text
- http://satyavnetworks.com/fck_upload_images/file/11974205218.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=adding+and+subtracting+polynomials+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_off0000df4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF4D	17248 bytes
SHA-256: `86a90fb400cbcb47a1a6a090d1d21b7b1d427909971841695780a6595ebb5dc3`
`font_01_sfnt_off00010c14.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C14	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001242b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1242B	11168 bytes
SHA-256: `7a060dda8b4ea4e571d35417e4314d034925fb238123b5dfa13927b448c30fbf`

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