PDF malware analysis — malicious · 90270820c93ea197

MALICIOUS

PDF

86.9 KB Created: 2021-09-16 19:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 04a8f6f994467c95a224d50ea0d4934b SHA-1: cc966b1545a573fc5862fb81cead77b1480c2b63 SHA-256: 90270820c93ea1979e5104a318bd696edd99f8b0c08ee10b7a1a7164f2c520c1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection profile indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://wastran.ru/uplcv?utm_term=download+game+bright+memory+mobile+beta+offline PDF link annotation
- https://alrashed-alsaleh.com/userfiles/files/95357135132.pdfIn PDF document text
- https://daaeportrett.no/upload/file/bukup.pdfIn PDF document text
- https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/dvu7p9m755du8p8j3dsoldfl9f/25521664221.pdfIn PDF document text
- http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecaca22bca---40960087874.pdfIn PDF document text
- http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/78294139973.pdfIn PDF document text
- https://hopadive.cz/ckfinder/userfiles/files/65295485096.pdfIn PDF document text
- http://www.corazondelsol.es/ckfinder/userfiles/files/7702234397.pdfIn PDF document text
- https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161403205430d7---35361430332.pdfIn PDF document text
- http://spy-military-labs.com/userfiles/file/9929333563.pdfIn PDF document text
- http://xhzhengli.com/upload/pumumuvugapifofumasemisuv.pdfIn PDF document text
- http://tangiahoang.com/skinkorea/Images_upload/files/2525241001.pdfIn PDF document text
- http://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/zezadowipige.pdfIn PDF document text
- https://srilangkapools.com/contents/files/91755237050.pdfIn PDF document text
- http://rtm-plus.ru/ckfinder/userfiles/files/50186916388.pdfIn PDF document text
- http://dep14kirov.ru/userfiles/file/newujemifezilafelekil.pdfIn PDF document text
- http://kuresi-kaitori.com/upload/content_pic/files/kagezaraxugafowodupitiv.pdfIn PDF document text
- https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143309ea98cc---92643563722.pdfIn PDF document text
- http://robertfeinberglaw.com/images/edit_images/file/8274871348.pdfIn PDF document text
- https://eric-parnes.shortex.com/ckfinder/userfiles/files/51972925197.pdfIn PDF document text
- http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16140e59e5a763---faxuzofuvadasinemigali.pdfIn PDF document text
- https://www.afoa.org.ar/backend/ckfinder/userfiles/files/wepopowokatodimefuvinof.pdfIn PDF document text
- http://alexdisinfestazioni.com/userfiles/files/22604491669.pdfIn PDF document text
- http://csc0451.com/userfiles/file/20210913205810_mse8jf.pdfIn PDF document text
- https://leanuslab.com/UserFiles/file/baxowabutesavujubojapodam.pdfIn PDF document text
- https://movimientofamiliadejesus.com/images/uploaded/file/57032576657.pdfIn PDF document text
- https://smilaxlabs.com/userfiles/files/mapizivomik.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_off0000e7cf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7CF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ffe1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFE1	19364 bytes
SHA-256: `beb86d08d3e22de0972a79690351f5f0d4a77160fe02abe920745ce5ee767f26`
`font_02_sfnt_off00013290.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13290	10972 bytes
SHA-256: `aa29b4a8bec0b2d8cff0ab815b3e690fd9051b5c3afda8cd390890dd8e0d4455`

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