PDF malware analysis — malicious · 4d3f94ab440b9ba6

MALICIOUS

PDF

85.2 KB Created: 2021-09-02 18:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: d1b4e7b2bbb309acaacb57d076fb15a5 SHA-1: e91db7bfb19bb74ae0541e8330e920c4cf46ba6a SHA-256: 4d3f94ab440b9ba604f1efd782fdad4a39c0ea9458b8a711493df39724c44d66

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9849

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://clubslotalmatriche.com/calcas/file/89875075882.pdf In PDF document text
- http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089af1691f02---2614165983.pdfIn PDF document text
- https://fsreloading.com/userfiles/files/bajekurosugazeviredawax.pdfIn PDF document text
- https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747c8e07777---busuteru.pdfIn PDF document text
- https://ngonluathan.vn/images/ckeditor/files/bakobeled.pdfIn PDF document text
- http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105e644089f5---vasurijomatuminavurakaf.pdfIn PDF document text
- https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/9a933e77f176f7af623e2b3d06f18dda/ximarenek.pdfIn PDF document text
- http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a0efb8fa8---24973504498.pdfIn PDF document text
- http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20216301748155292.pdfIn PDF document text
- https://reitinguok.lt/userfiles/file/14626586250.pdfIn PDF document text
- https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/6mk06oblotvci16mi55pf2h42u/90648267353.pdfIn PDF document text
- http://mosjob.ru/images/file/17799051213.pdfIn PDF document text
- https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d1b88b2e9---zosebukukij.pdfIn PDF document text
- https://confidence-ist.com/ckfinder/userfiles/files/81227562334.pdfIn PDF document text
- https://viettrungson.com/media/Files/somovufuvezemoluvem.pdfIn PDF document text
- http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ad1283be5---puzogodobuzojep.pdfIn PDF document text
- https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/93ec4dce2681a32421ebb72604446223/nabixomavalowotuneruwade.pdfIn PDF document text
- http://de-ko-gmbh.com/ckfinder/userfiles/files/5537864650.pdfIn PDF document text
- http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2674888582---fogotaguwowa.pdfIn PDF document text
- http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086e16dd27ab---92321812152.pdfIn PDF document text
- http://rockycheng.com/ckfinder/userfiles/files/sobunisalekepamujitoxivir.pdfIn PDF document text
- http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/kudibagizalipu.pdfIn PDF document text
- https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/351f2178e6ad7cde02e5ae4ea1447327/74416063775.pdfIn PDF document text
- https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bcdd78645---tuvekalija.pdfIn PDF document text
- https://e-tta.com/app/webroot/userfiles/files/79715035668.pdfIn PDF document text
- https://muzeumkonstancina.pl/attachments/file/16958838441.pdfIn PDF document text
- http://gpmpoolandspa.com/ckfinder/userfiles/files/52514638449.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=slim+jim+rubbermaid+pdfPDF 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_off0000e913.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE913	10612 bytes
SHA-256: `09ef78e7488f6fee5aed080567b05e638973ce44f7bd558b37cf3e90d706cfd4`
`font_01_sfnt_off000100ff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x100FF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011911.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11911	17768 bytes
SHA-256: `0445e2f93ec141e2a306e265e147b49ae3c696fe7f4a5a6a5b2a0e3b2eff447c`

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