PDF malware analysis — malicious · ed923699c73af3f9

MALICIOUS

PDF

86.2 KB Created: 2021-06-30 02:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 531b3639186e66fb418d9a11e6d0e3b2 SHA-1: 4eb9c29bc70c4ccb3fd828e6f09c269682aec8ca SHA-256: ed923699c73af3f9878faae1ec4bd9de5cb90a5d5a827d7a0bced2c861789d95

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, pointing to numerous URLs hosted on compromised CMS platforms and disposable domains. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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 https://muzeumkonstancina.pl/attachments/file/90539711332.pdf In PDF document text
- https://twinslock.com/ckfinder/userfiles/files/65200694084.pdfIn PDF document text
- https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/3db16c68c2e11616c719c0255ba36453/35954489189.pdfIn PDF document text
- http://seoulsquare.com/userfiles/file/22093188363.pdfIn PDF document text
- https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/tkgnpc0ssb87env2no7nenvfbb/58623384838.pdfIn PDF document text
- http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad2e0d7ece---39737638675.pdfIn PDF document text
- http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e8e6786a6---42625883002.pdfIn PDF document text
- https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/j0vto74rtsacbpd04m7esa7kb6/87970806183.pdfIn PDF document text
- http://amphorabeautyclub.com/campannas/file/ganub.pdfIn PDF document text
- http://xn--d1achljw0b.xn--p1ai/content/upload/bijimowezuwifidujuru.pdfIn PDF document text
- https://pima-alarms.rs/slicice/file/wanebufapomi.pdfIn PDF document text
- https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/bde6c1b1503b309d33f64f73034f2dff/68345842429.pdfIn PDF document text
- https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/b1orv10730knb45cdakcsknr4j/15015464288.pdfIn PDF document text
- https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/18a3648b6043092816b96cbfe21cddd4/nolumir.pdfIn PDF document text
- http://budohurtsa.pl/userfiles/file/79548174885.pdfIn PDF document text
- https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30be089b39---vilorelup.pdfIn PDF document text
- http://mail-ex.net/userfiles/file/kipunapumukuvir.pdfIn PDF document text
- https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713e33c9d16---fegokefuguziv.pdfIn PDF document text
- https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/46rpt942pq12ujuk5ac720cud3/61932949276.pdfIn PDF document text
- http://aylincinarli.com/fckfiles/file/53474505562.pdfIn PDF document text
- http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0805140d5---tilivavenatij.pdfIn PDF document text
- https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/3431031825e391fbb7a71fa649401540/wiwon.pdfIn PDF document text
- http://bygreenpure.com/userfiles/file/gexenelixiwi.pdfIn PDF document text
- https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/c20f484f5544c0ff734f3151ec76bfbb/91879195902.pdfIn PDF document text
- https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/843a42a22ce9d7781d78e75366239816/wejowofonaravudiradixoze.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=the+hermosa+hotelPDF 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_off0000edd3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDD3	18116 bytes
SHA-256: `db97887d31a421d0c9261ebb6490a0502eb250b77f0dccecb7f534a54cc8132a`
`font_01_sfnt_off00011ce2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CE2	10140 bytes
SHA-256: `657551f5d3d7d9511388307eccd7bd54bd30d63785e0338394598f563ad5b896`
`font_02_sfnt_off000133a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x133A0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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