PDF malware analysis — malicious · 9b78f5b821b2a614

MALICIOUS

PDF

71.8 KB Created: 2021-09-25 02:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 44b99fae2334bd6acd6d3354ed8b70b9 SHA-1: f62ce9e47dc943662c1683c85902955415618e70 SHA-256: 9b78f5b821b2a614cb56f6b1ceb3e66f936b6f5dd62ca07ad5441cf4ab927115

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to download malicious content. The presence of PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://paintmaster.hu/js/ckfinder/userfiles/files/32998040352.pdf In PDF document text
- https://termokingbt.com/ckfinder/userfiles/files/bovukutewapivamuzipuropo.pdfIn PDF document text
- http://techsystem.gr/data/uploads/ckeditor/files/zufexineradepewed.pdfIn PDF document text
- http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/pakoxirixuzom.pdfIn PDF document text
- http://atreve.eu/ubezpiecz/obrazy/file/weguw.pdfIn PDF document text
- http://taiwangallant.com/uploads/files/202109041624058250.pdfIn PDF document text
- https://pasarangroup2.com/contents/files/70720576735.pdfIn PDF document text
- http://vin-baietii.ro/ckfinder/userfiles/files/43935805333.pdfIn PDF document text
- https://venusnvs.com/userfiles/file/7647706587.pdfIn PDF document text
- https://vmwarts.com/ecovic/file/8097472231.pdfIn PDF document text
- https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/10c49d8e933f10e78d061273605a226b/mowetawemuxulomivoralafu.pdfIn PDF document text
- http://stensoproject.com/userfiles/files/febagekuvetovotot.pdfIn PDF document text
- https://rajatotogroup4.com/contents/files/tavulutenebatalovedar.pdfIn PDF document text
- https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/91846115715.pdfIn PDF document text
- http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149b3ef1dd13---xugogufojali.pdfIn PDF document text
- http://lamekatus.com/uploads/ckeditor/files/belefe.pdfIn PDF document text
- https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/a1aabaac8ddd59be3c1643f16fd050fc/71195849799.pdfIn PDF document text
- http://erodiertechnik-wenzel.de/userfiles/file/23314315046.pdfIn PDF document text
- https://guijek.com/userfiles/file/mofajebak.pdfIn PDF document text
- https://isigakizima.net/img/tmp/file/45253203276.pdfIn PDF document text
- http://dealershop.es/userfiles/file/vosomuvire.pdfIn PDF document text
- https://preprodpcb.com/userfiles/files/rujejedapodolimut.pdfIn PDF document text
- http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141b462beed4---wijegufog.pdfIn PDF document text
- http://olgapolyakova.de/files/files/vivatod.pdfIn PDF document text
- http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/nekipipigazulubif.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=tivimate+full+apkPDF 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_off0000b729.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB729	16864 bytes
SHA-256: `592c483360c7778e530ea844e3fd5790c04a99dc3f6be97ed7ba981dc6d15389`
`font_01_sfnt_off0000e26a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE26A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fa81.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA81	10248 bytes
SHA-256: `07c3ea5bcd4ff957d1b37daae6bde6360cb61710f21b02979e713ffe3d56c89b`

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