PDF malware analysis — malicious · 7b81f5dc37b48d40

MALICIOUS

PDF

94.5 KB Created: 2021-08-04 07:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22

MD5: 6b9e6d8632bdc9678112bd2c306183ae SHA-1: 2ee04cbcb768ad24052e9844df565d3ac040a63c SHA-256: 7b81f5dc37b48d4031cb59bea99d9dcb8730ca51481ecb95338c0636cd665f67

244 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure and a security-bypass lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9914

Heuristics 9

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
Security software disable instruction high SE_SECURITY_BYPASS

Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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=free+executor+for+roblox+no+virus PDF link annotation
- https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/b52f4t8nl42j3b2gnmgtl018qq/gutijaxovawofeg.pdfIn PDF document text
- http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/454774525.pdfIn PDF document text
- https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/b4e636126e9f296a139983e0de44b589/29167355938.pdfIn PDF document text
- http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a144e8e0776---97044473563.pdfIn PDF document text
- http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10fa9e72cf---28795373403.pdfIn PDF document text
- https://lanhcongnghiepthinhphat.com/upload/files/63869316178.pdfIn PDF document text
- http://abwalabamaave.com/uploads/files/6961435022.pdfIn PDF document text
- https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/4239c13fb616de2bbc659d6e4ad59d06/bivojomivowujexufuv.pdfIn PDF document text
- http://ankaser.com/userfiles/file/58190563348.pdfIn PDF document text
- http://cedule-plachty.cz/files/file/32632290742.pdfIn PDF document text
- http://zuche0551.com/upload/file/jewig.pdfIn PDF document text
- http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a050f52fc0---walegajunogukivum.pdfIn PDF document text
- http://activesolutionelectric.com/images/file/85881139198.pdfIn PDF document text
- https://nepalmicrofinancesummit.org/userfiles/files/50169781137.pdfIn PDF document text
- http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a73693556a2---jizerobusanagixiron.pdfIn PDF document text
- http://vasvaripalmuzeum.hu/upload/file/rinasonobowedadusak.pdfIn PDF document text
- https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6bf3def0f---mijefiza.pdfIn PDF document text
- https://whitesal.com/data/images/file/6489_20210703151735.pdfIn PDF document text
- https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a5d560090---xibowerusewatadaxejof.pdfIn PDF document text
- https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/q1rifsmm4ccbc7o7bkff5kg5b0/82316193244.pdfIn PDF document text
- https://drticket.ir/basefile/drtiketcom/files/xotowazokokezoxuluwi.pdfIn PDF document text
- http://promocode.lu/userfiles/files/3537446769.pdfIn PDF document text
- https://hankilfood.com/upfile/files/83173854770.pdfIn PDF document text
- https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/2919dad70db95976cbac5fa145412aec/92591981414.pdfIn PDF document text
- https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/4eh1egs5dos63598viindhfr9v/nevanir.pdfIn PDF document text
- http://technology-mp.it/userfiles/files/levixifepafikamisodasit.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f642.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF642	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010e59.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E59	10552 bytes
SHA-256: `4b479ee06f46866cb9e969b2e51bd6e0d5e743cabc675425417394be03a18c20`
`font_02_sfnt_off0001268d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1268D	16144 bytes
SHA-256: `fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516`
`font_03_sfnt_off00013c08.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13C08	17832 bytes
SHA-256: `0c888acde6d3fbed5c56bd20bcee33777f68dc3fecdf5eff7b5872896cbca609`

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