PDF malware analysis — malicious · 82fe2cc15b2d2b84

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 17:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 9d8b5e30a0f726395ff2cf941a553aca SHA-1: 92ceea4164a308311e6a10175279bb6e09c9ca99 SHA-256: 82fe2cc15b2d2b843ede41f5435f57266fe6fd174ffdf4f87a0d19cdcabd3c39

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=how+to+delete+all+photos+from+android+phone+permanently PDF link annotation
- https://listapp.in/ci/userfiles/files/28532922523.pdfIn PDF document text
- http://impactpluslearning.com/ckfinder/userfiles/files/42666324310.pdfIn PDF document text
- http://vistobrasil.net/uploads/file/10369133321.pdfIn PDF document text
- http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/kuwalejivadidiwu.pdfIn PDF document text
- https://keralatemples.info/ckfinder/userfiles/files/21855119053.pdfIn PDF document text
- https://jbdclothiers.net/emailer/userfiles/file/68088541217.pdfIn PDF document text
- https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/edmhe866n8agvejs50f02kg956/2407501429.pdfIn PDF document text
- http://etalentlink.com/uploadfile/file///2021091116041416.pdfIn PDF document text
- https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2ecee621c---21952838024.pdfIn PDF document text
- https://www.lsv-wittlage.de/ckfinder/userfiles/files/10029828322.pdfIn PDF document text
- http://hanasushipickup.com/uploads/files/48539652543.pdfIn PDF document text
- https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161425445672f7---67277196046.pdfIn PDF document text
- https://weyergans-hcc.lv/userfiles/file/32299161934.pdfIn PDF document text
- https://stichtingech.org/ckfinder/userfiles/files/negobikaxetezesogugure.pdfIn PDF document text
- http://bioaec.com/userfiles/files/wexapexizatexexogi.pdfIn PDF document text
- http://rjbmachinery.com/d/files/wawebipigabaje.pdfIn PDF document text
- http://sirindhorn.net/upload/File/39111069063.pdfIn PDF document text
- https://huangs.tw/uploads/files/202109151400581283.pdfIn PDF document text
- https://marbeyoyun.com/calisma2/files/uploads/59589621054.pdfIn PDF document text
- http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614209af80382---demaruvopubu.pdfIn PDF document text
- http://slovbau.sk/test/userfiles/file/44074270911.pdfIn PDF document text
- http://vibrobeton.by/pics/files/8396795047.pdfIn PDF document text
- https://jatransfer.com/userfiles/file/kexapedejilat.pdfIn PDF document text
- http://tehpromyar.ru/media/file/vepikake.pdfIn PDF document text
- http://rungruangsteel.com/public/upload/userfiles/files/notozitemafefuvojawud.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_off0000d4a6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD4A6	10952 bytes
SHA-256: `add7f42d91658fca0c2e33c2a06747f9530751f00e54865e8ce488a1ad789a38`
`font_01_sfnt_off0000eddf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDDF	17472 bytes
SHA-256: `d691f739910822ca2afb831d95e4469d77c1ebfe540b3acf8e42ebc805e0e201`
`font_02_sfnt_off00011aa8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11AA8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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