PDF malware analysis — malicious · 7762e68b992fb60d

MALICIOUS

PDF

95.3 KB Created: 2021-07-19 08:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 4b72ded5192ba2620d913f0042e64eb8 SHA-1: 5bb009c1d75c77b98cd8f3fe0566d35814119b29 SHA-256: 7762e68b992fb60d44e54b7485169b385bd37e6de202e31b635c051ea30110be

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The 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 storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9769

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 http://vds-construct.pl/userfiles/file/18703428067.pdf In PDF document text
- http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160834b092f10a---85873379474.pdfIn PDF document text
- http://alemotta.com/resources/original/file/vozikepipilanas.pdfIn PDF document text
- https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/950745944c5ec56e821a3fcb7572c627/wobexi.pdfIn PDF document text
- http://dietetyka-24.pl/images/files/mezexitovokapanaseve.pdfIn PDF document text
- https://ivanda-commerce.hr/userfiles/file/95352390962.pdfIn PDF document text
- https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/2gclkqfa3n3os861d1iafbre7o/jixuvexewonem.pdfIn PDF document text
- https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/j0dtrukjqbl03o963vtliq3fto/11570630646.pdfIn PDF document text
- https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/8a2b1c2ed6e9c2ec2d9b267bc48c100c/81933866594.pdfIn PDF document text
- http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed936738c79---dawofikitixabi.pdfIn PDF document text
- http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c206d4a10f7---59503734936.pdfIn PDF document text
- https://flyags.com/editorResources/file///10973047586.pdfIn PDF document text
- http://poorclarescork.ie/images/vixopogidusanovugijezu.pdfIn PDF document text
- https://gretajensen.com/ckfinder/userfiles/files/98557373578.pdfIn PDF document text
- http://myjobcareer.net/userfiles/file/2021052200452973499.pdfIn PDF document text
- http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a69714144f---gosifadatadimawaxosutiper.pdfIn PDF document text
- https://cecprint.com/images/file/30479735166.pdfIn PDF document text
- https://www.profiemg.cz/upload/ck/files/18108447320.pdfIn PDF document text
- http://kukubara.com/zdjecia/file/59855410510.pdfIn PDF document text
- https://fiberglasssupplydepot.com/userfiles/file/98717037307.pdfIn PDF document text
- http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c945bf2bbe---zasevasepanimekutubevugaz.pdfIn PDF document text
- https://cubic.is/userfiles/file/gamugu.pdfIn PDF document text
- http://ottotech.center/userfiles/file/79865881650.pdfIn PDF document text
- http://avtokit116.ru/!upload/files/niwikedubipujatotak.pdfIn PDF document text
- http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/2da39d421fee55b46531268dd1207530/69597879406.pdfIn PDF document text
- https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/b8621668f6fbf64c43280847fe9284c3/23421997988.pdfIn PDF document text
- http://szguilong.com/userfiles/files/wodoliwosoxi.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+ripen+avocado+instantlyPDF link annotation
- 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_off0000fbda.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBDA	10764 bytes
SHA-256: `3a698f634021bf50c6d46fd721faa6f83eeea80a410a498b811bfdbb6cce256f`
`font_01_sfnt_off000114c8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x114C8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012cda.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12CDA	17224 bytes
SHA-256: `f270a1fec44d76c91392958c871e508c2d51dd1f1b0629f504c375d3b9a97ba2`
`font_03_sfnt_off000159da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x159DA	16092 bytes
SHA-256: `9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd`

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