PDF malware analysis — malicious · 41c6edf1096e1523

MALICIOUS

PDF

74.9 KB Created: 2021-06-27 03:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 16ea2d771a270041bf3652da55ef39a2 SHA-1: f45d8a57fe9f938fbe51d78c621ea98254c040a6 SHA-256: 41c6edf1096e15233e59c1fb8446e103738132cb4ad15db1224c49e43ba32983

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

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

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=embedded+files+in+pdf PDF link annotation
- https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/421568e7432f9604f453f24fd7dbbbcc/vidoj.pdfIn PDF document text
- http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bced6b9fe---gefilekakikilimesabe.pdfIn PDF document text
- http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ad7a9cfc6---tivibuwizulifa.pdfIn PDF document text
- https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/243dc39ccf58c8d825c67a85650a1cf4/tuxivinigowofuvani.pdfIn PDF document text
- https://stopserv.ru/files/file/53811872721.pdfIn PDF document text
- https://rajatotogroup4.com/contents//files/68835490254.pdfIn PDF document text
- http://kotolantopeni.cz/file/jazojizegekugelojufe.pdfIn PDF document text
- https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d4d2419b36152bd72acb9b9b2c9cd332/92840778600.pdfIn PDF document text
- http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b302d1e9d2a---pejijawejolanenesuguxir.pdfIn PDF document text
- https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d65ba79ea2---duwopesowobol.pdfIn PDF document text
- https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093afbd5b63a---mutetaxudedokiwizitedanop.pdfIn PDF document text
- http://skupka23.ru/upload/m/38253424721.pdfIn PDF document text
- https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/e859af4c62110bd0943c0601d3e761e3/10406766122.pdfIn PDF document text
- http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160928271710c9---bolinapabexaf.pdfIn PDF document text
- https://liniagdanskzydowo.pl/files/50132559113.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6c03e340f---4225982825.pdfIn PDF document text
- http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d07c0d7786b---97954197251.pdfIn PDF document text
- http://tasteofruraleurope.eu/upload/File/zavejemijexeboninotatoxe.pdfIn PDF document text
- http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/f58283a71990d7c29bee470de2f60454/jejigajifasufagamige.pdfIn PDF document text
- http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71f182d587---21473548300.pdfIn PDF document text
- https://www.mds-horizons.com/upload/files/4430667622.pdfIn PDF document text
- https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/hts54ha2s7vc32r4gejqo6li93/vozeviragiwozalunezij.pdfIn PDF document text
- http://didocrosby.com/imagenes/file/77386024644.pdfIn PDF document text
- http://longarmacademy.net/fckeditor/userfiles/file/45800120314.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_off0000c4db.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC4DB	16604 bytes
SHA-256: `acbd58e408b7476a9178e23ba87313ca65797f84659b20dd174f1295861ce114`
`font_01_sfnt_off0000efb5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFB5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000107cc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107CC	10300 bytes
SHA-256: `be9e293cf2dfd916aedbc7a6c24ebfb1eb826f284978962061ce859d2086b4a5`

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