PDF malware analysis — malicious · 651195f088efdff8

MALICIOUS

PDF

93.1 KB Created: 2021-09-20 03:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 17f7093b3612871f966728abd819866c SHA-1: b0d84f24143397dda7f62a3626c770c674d0a60d SHA-256: 651195f088efdff8910036718220fd74e45faa5bd5574a102ed3c3335c32bdef

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm detections strongly indicates a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9726

Heuristics 6

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.
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://laborke.ru/uplcv?utm_term=redmi+4x+price+philippines+2020 PDF link annotation
- https://ce-mi.pl/uploads/userfiles/files/46735760123.pdfIn PDF document text
- https://villanakarin.com/userfiles/files/voxofefuwuruwegotami.pdfIn PDF document text
- http://digitalqwerty.com/ckfinder/userfiles/files/jifebap.pdfIn PDF document text
- http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613870a85dd1e---96242186891.pdfIn PDF document text
- http://cbstav.cz/file/83272910451.pdfIn PDF document text
- https://thebottombillion.org/business_school/uploads/file/fidixirewogegarimine.pdfIn PDF document text
- http://skpizzasubs.com/uploads/files/voxemojozedez.pdfIn PDF document text
- http://mbjarrahi.com/UploadedFiles/New/file/xasonakip.pdfIn PDF document text
- http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ea8086f6a452708049b18049f8241947/gekozi.pdfIn PDF document text
- https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/5nka6v32803hvpp21383kh6pmh/10050299473.pdfIn PDF document text
- https://inijariku.com/ckfinder/userfiles/files/nukakero.pdfIn PDF document text
- http://cybernet-ap.com/UserFiles/File/fiwikevixarizu.pdfIn PDF document text
- http://kdwatch.net/upload/files/2021090421551063.pdfIn PDF document text
- http://grupposcorcia.it/userfiles/files/zubuzadul.pdfIn PDF document text
- https://childprotectionindia.com/lexcyberia/userfiles/files/jabutaxoju.pdfIn PDF document text
- http://drukarnia-warszawa.pl/pliki/file/juzuvexitupupivixube.pdfIn PDF document text
- https://alcoquimicos.com/ckfinder/userfiles/files/vugedisulebujiwep.pdfIn PDF document text
- http://hoteldanang.com/uploads/images/files/82841579562.pdfIn PDF document text
- http://hansungid.com/userfiles/file/73076620177.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161477a3be5995---tizupomibe.pdfIn PDF document text
- http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ee740faa7b50b6c5d862b66956a0b6aa/83407570008.pdfIn PDF document text
- https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16146443a4af9f---minolujewowudujepogimokep.pdfIn PDF document text
- http://www.leposeur.fr/site/upload/ckfinder/files/dikadusikirazorixivuj.pdfIn PDF document text
- http://swotaweb.com/img/upload/file/xugejosapokudovetovelozow.pdfIn PDF document text
- http://thamcohoaian.com/webroot/img/files/futani.pdfIn PDF document text
- http://ehomerealestate.org/images/file/12951550049.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_off0000e2cb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2CB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fae2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFAE2	10868 bytes
SHA-256: `918c5b5e858b465b73321f5a691393a31358edec852ce412d0a6e1173d4c74fb`
`font_02_sfnt_off000113ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x113CA	16132 bytes
SHA-256: `071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137`
`font_03_sfnt_off0001293d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1293D	23880 bytes
SHA-256: `5b5fbee8e0ed4fa5954a671e71beba4662649da6f15eccc8a5dc3389942e81f4`

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