PDF malware analysis — malicious · dc635544536a4c36

MALICIOUS

PDF

87.1 KB Created: 2021-07-09 00:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 81fc806292737e85e8993a64c6f5bdd8 SHA-1: 2a66e88206315aae99c4bdec8120e1b6e67706a4 SHA-256: dc635544536a4c36198637b16f2f56ae31ca970bc2e26dde6663724c66f3d500

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics show it functions as a link farm, directing users to multiple compromised WordPress sites and other unknown hosts, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to exploit user trust by luring them to external malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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 http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/tdqq21ijapcrnhcfaafn88hb3h/nosesisu.pdf In PDF document text
- http://moreit.ch/productinfo/file/zowodisomedigogalolinener.pdfIn PDF document text
- http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/64355859795.pdfIn PDF document text
- https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57ae5200a2---83179206211.pdfIn PDF document text
- http://itkaufmann.com/images/fckimages/file/nepisepinovix.pdfIn PDF document text
- https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/imhrcplsp3n8bag78r3113g761/1193056240.pdfIn PDF document text
- http://meyergarden.com/ckfinder/userfiles/files/nofiz.pdfIn PDF document text
- http://18554080.com/userfiles/file/xumidataju.pdfIn PDF document text
- http://thsport.dk/ckfinder/userfiles/files/movotabedez.pdfIn PDF document text
- https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa7af28357---lubumixeridiwuzoduwak.pdfIn PDF document text
- https://eventpro-kontraktorpameran.com/uploaded/files/6858269071.pdfIn PDF document text
- http://polletnv.be/uploads/files/73095077574.pdfIn PDF document text
- https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b6debd77ac9a4b2e5e1c5bc2a5d38788/vopojoxafuxojasafe.pdfIn PDF document text
- https://sasalidayanisma.org/uploads/file/gedefifet.pdfIn PDF document text
- http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a6293b1c52b---simujuzapiwodulujipome.pdfIn PDF document text
- https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/0876111327dcbb38dce4b90804d798c1/xeriwuwi.pdfIn PDF document text
- http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/9fe74311b749ec9c1ea741f8d0b99b3d/sosiga.pdfIn PDF document text
- http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a388802fadb---53255468797.pdfIn PDF document text
- https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/51i5kl1hlkn7qv82fle23quj3l/newikaxawelex.pdfIn PDF document text
- https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d043e217f---75745941939.pdfIn PDF document text
- https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7cac3e84b---41576959491.pdfIn PDF document text
- http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087436fd3e7b---2592156294.pdfIn PDF document text
- http://studiospazioambiente.it/userfiles/files/52324455321.pdfIn PDF document text
- https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/2ebe45dbdaa0d20af8ba47e42dfff1bb/relomekexirilurowagap.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=loan+prepayment+chargesPDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f1dc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1DC	10756 bytes
SHA-256: `2dd6b1870207f03c6812155dc370812eb86832e5be706783d3b09e76cbeb0e79`
`font_01_sfnt_off00010a73.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A73	17196 bytes
SHA-256: `9c8e9645f9aaf1501077947eddd0c9b8a596a1a841a4448c3d9332775a5c0e1c`
`font_02_sfnt_off00013775.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13775	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

Open this report in the interactive analyzer, or submit your own file for analysis.