PDF malware analysis — malicious · 39718fce1b2e79a3

MALICIOUS

PDF

79.3 KB Created: 2021-09-16 02:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 109e24a18d269abc99535d03e00d6aa4 SHA-1: 29f9c15495146aeed92869e045e6331b0789a639 SHA-256: 39718fce1b2e79a35a276878631a9ddbbdc022aaea231a0361dab22138a9178d

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. The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malware or phish for information. The presence of external URIs and the overall structure strongly suggest this PDF is used as a lure to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8589df2ce---98177609400.pdf In PDF document text
- https://oykufestivali.com/ckfinder/userfiles/files/2073352452.pdfIn PDF document text
- http://clinton.abwingsmd.com/uploads/files/keselunokupisamojavalen.pdfIn PDF document text
- https://travelworld.ro/userfiles/file/sotuxaza.pdfIn PDF document text
- http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613be9ca9a0d5---nagujefefubewuvilexujil.pdfIn PDF document text
- http://elmbbq.com/uploads/files/kedit.pdfIn PDF document text
- https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/12a06998d9ef7f59a502edb7724e1963/64787895886.pdfIn PDF document text
- http://refinerlink.com/userfiles/file/davisisoxomigugupuguxawo.pdfIn PDF document text
- http://nmways.com/uploads/fckupload/file/ginegowaxav.pdfIn PDF document text
- http://sangtaoad.com/uploads/userfiles/file/74940980355.pdfIn PDF document text
- https://ku4ysk-9lgp4y.com/contents/files/5565670831.pdfIn PDF document text
- http://bamor.org/userfiles/file/43777196734.pdfIn PDF document text
- https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/eeng4116600qhnv10k78vs3ucq/60823522033.pdfIn PDF document text
- https://megacook.pt/site/upload/file/tejitokura.pdfIn PDF document text
- https://lacgl.org/upload/editor/file/lilevob.pdfIn PDF document text
- http://radecznica.pl/userfiles/file/78897934967.pdfIn PDF document text
- http://bpsstudio.hu/uploads/14082660144.pdfIn PDF document text
- http://kirsanov-maslo.ru/uploads/68111921246.pdfIn PDF document text
- https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/6a204ee2ec733c53933173824e546c7d/pebanufo.pdfIn PDF document text
- http://ptsound.com/plugins/ckfinder/userfiles/files/25518535230.pdfIn PDF document text
- https://derya.afmiletisimajansi.info/resimler/files/82613528027.pdfIn PDF document text
- http://toyteepee.com/uploadfiles/file/210903043335127673ifm85c.pdfIn PDF document text
- https://futurefacesnyc.com/uploads/file/16814358414.pdfIn PDF document text
- http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614263db61bde---67264971840.pdfIn PDF document text
- https://dla-pracownika.pl/pliki_user/File/10682289416.pdfIn PDF document text
- http://ablerexthailand.com/userfiles/files/15365645801.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=download+apk+auto+clicker+automatic+tapPDF 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_off0000d3cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD3CD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ebdf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBDF	16484 bytes
SHA-256: `a61303506ac0c82b58f7a9f101278012b915c8cd1e42791718606ddb7b529ccd`
`font_02_sfnt_off000116c1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x116C1	10788 bytes
SHA-256: `84fec6213e5eff212776effe7c13a673338261c46464a6a6acc919cc370a6949`

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