PDF malware analysis — malicious · aab3cdd2313e94e6

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 23:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 74c32cd02e1c288cbfbefe1fd284eb91 SHA-1: c8388e09c92d40fa6e9c304bc8a7489f8112eadc SHA-256: aab3cdd2313e94e615b886d2485f7265d8b1444251d0d1149b15f59aa2fea0db

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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://chcial.ru/uplcv?utm_term=chromatic+tuner+app+free PDF link annotation
- http://upakuika.com/img/file/voverisifexigon.pdfIn PDF document text
- http://all-premium.com/user_file/files/14154318008.pdfIn PDF document text
- http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0f98af624---1055654996.pdfIn PDF document text
- http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16136ae3527f05---97798441665.pdfIn PDF document text
- https://anpheatingandac.com/nbloom/fckuploads/file/93855536502.pdfIn PDF document text
- http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9234b256---17761070448.pdfIn PDF document text
- http://cka-shiba.com/ckfinder/userfiles/files/7188510311.pdfIn PDF document text
- https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fccd507e6f---80765045946.pdfIn PDF document text
- http://oskarmak.com/userfiles/file/gexomamogewizekugut.pdfIn PDF document text
- http://www.binghan.my/userfiles/file/buzuxevuloje.pdfIn PDF document text
- https://alyosserspneed.com/userfiles/files/5932401368.pdfIn PDF document text
- http://freeware-software-download.de/uploads/editor/file/75201029764.pdfIn PDF document text
- https://hockeymro.ca/docs/file/48425853282.pdfIn PDF document text
- http://creative-format.com/upload/editor/files/fekiwesivubosamoxo.pdfIn PDF document text
- https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135f8dd0b2f0---93568469108.pdfIn PDF document text
- http://amsuatrust.org/survey/userfiles/files/xizunepoxataval.pdfIn PDF document text
- http://zatuchlina.cz/upload/file/sewezoxawaxeporuxewut.pdfIn PDF document text
- https://inprovitparaguay.com/ckfinder/userfiles/files/salezosavani.pdfIn PDF document text
- http://kme-kme.cz/files/file/xopugewika.pdfIn PDF document text
- https://rotterdampools.com/contents/files/rikomo.pdfIn PDF document text
- http://www.valathors.com/ckfinder/userfiles/files/5409330796.pdfIn PDF document text
- http://immobiliareborghi.com/userfiles/files/10576007459.pdfIn PDF document text
- http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138138ee7906---lazow.pdfIn PDF document text
- https://praktijk-fix.nl/userfiles/image/file/71030945917.pdfIn PDF document text
- https://safewatersolutions.in/ckfinder/userfiles/files/29984363857.pdfIn PDF document text
- http://freetourscadiz.com/ckfinder/userfiles/files/30457603200.pdfIn PDF document text
- https://medicentrumnz.eu/medicentrum/files/file/vukepuzaposupizepajebi.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_off0000ddb8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDB8	10664 bytes
SHA-256: `c234faf3307763398f30984190f5389e18e023be035f2c8a2cf444fb5bec083b`
`font_01_sfnt_off0000f603.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF603	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010e15.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E15	19124 bytes
SHA-256: `d83ec8ca742ac257380a9ec3c0009b5a742b69552f7753adfb808180516abc2c`

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