PDF malware analysis — malicious · 8c4e7507d1ad32a1

MALICIOUS

PDF

76.2 KB Created: 2021-09-16 07:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 810701d6dbad03f4c34f91a03946e23e SHA-1: c999001d5ea5cc8c0855a8fa9976a2107a3fcad1 SHA-256: 8c4e7507d1ad32a1688109ed38b3280a54febb9f6a373ae38d9067da45158c58

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9908

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://pistant.ru/uplcv?utm_term=vasudevan+biochemistry+for+dental+pdf+download PDF link annotation
- http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161361ed46c17b---subavagepubetatuti.pdfIn PDF document text
- http://studiocalderini.it/userfiles/files/pawabololanijodilupu.pdfIn PDF document text
- http://nhatngungoisaoxanh.com/upload/files/89683990699.pdfIn PDF document text
- https://alshaabcoop.com/userfiles/file/8713711802.pdfIn PDF document text
- http://namadagaskare.ru/ckfinder/userfiles/files/wikulurufuvavixarev.pdfIn PDF document text
- https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/c4eaa1d3dd7588984155a8d6463f65bb/77902834545.pdfIn PDF document text
- https://jordanadams.com/ckfinder/userfiles/files/lawumobagadejebifiso.pdfIn PDF document text
- http://daiichibus.vn/uploads/news_file/dixopojomiterojupiki.pdfIn PDF document text
- https://healthmatters.me/userfiles/file/4566256233.pdfIn PDF document text
- http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383a11448be---93460137949.pdfIn PDF document text
- http://techbis.pl/files/file/53194779164.pdfIn PDF document text
- https://principesgs.com/userfiles/file/83004457442.pdfIn PDF document text
- https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133db96daeac---ledajejitenakek.pdfIn PDF document text
- http://fkhd.cz/data/img/7704403310.pdfIn PDF document text
- https://promaxsuspension.com/csmimage/file/tujidikuto.pdfIn PDF document text
- http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613155575bd54---fopuburesotixekuja.pdfIn PDF document text
- http://wawa757.com/uploads/files/kijapunefuvefumu.pdfIn PDF document text
- http://kpotplace.com/uploads/files/6909804532.pdfIn PDF document text
- http://myarrahnu.com/mo_images/files/zolopuwajov.pdfIn PDF document text
- http://boilerservis.ru/uploads/files/jogasolerepenu.pdfIn PDF document text
- http://crmloccitanecr.com/campannas/file/42903979729.pdfIn PDF document text
- https://santchavarabed.in/ckfinder/userfiles/files/raxofu.pdfIn PDF document text
- http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140839bd6c9c---97564505467.pdfIn PDF document text
- http://maybomnuocdanang.com/uploads/image/files/fudes.pdfIn PDF document text
- http://phuongdonggolf.vn/app/webroot/uploads/files/26663751500.pdfIn PDF document text
- https://tivicom.vn/upload/files/36825829239.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_off0000c39f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC39F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dbb6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBB6	11360 bytes
SHA-256: `e10ef5b3f1d6333d80e6576f5348be3c7e3445ea8f927e9390fd11305f627d26`
`font_02_sfnt_off0000f61e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF61E	17332 bytes
SHA-256: `ae8931c3046fbcdc4519d5f6d2fe2030d0defac98accbb188abfd79eedd914b5`

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