PDF malware analysis — malicious · 233ed1348a792ec4

MALICIOUS

PDF

85.3 KB Created: 2021-08-16 02:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: c13f116e2d082069d38b22a1d028b6f5 SHA-1: c8b05bf14154d5462f162efed74af5bcc6b04e47 SHA-256: 233ed1348a792ec4cd0e76b02ff3c92be9d451398756254fff4f8231b3e51b73

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to distribute malware or engage in phishing. The presence of external URIs and the nature of the links indicate a likely spearphishing attachment as the initial access vector. No scripts were extracted from this sample.

Machine Learning

Nyx PDF Classifier malicious score 0.9982

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 https://egyiksem.hu/uploads/file/34448581656.pdf In PDF document text
- http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d57200543---37963901194.pdfIn PDF document text
- https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/93cbbb0ee3a60421105bb82c21fa23ba/71666045799.pdfIn PDF document text
- https://dichocungtoi.com/userfiles/file/8593378076.pdfIn PDF document text
- http://liubeauty.com/luutru/files/93169993642.pdfIn PDF document text
- https://hyundainhapkhau.vn/upload/files/dumabeluto.pdfIn PDF document text
- http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2b635d22c---74014982668.pdfIn PDF document text
- https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071ebdfa2cf8---20860142936.pdfIn PDF document text
- https://adikkedua.com/contents//files/jakenuripurupijumiwaril.pdfIn PDF document text
- http://odontoflash.eu/userfiles/files/91063753045.pdfIn PDF document text
- http://nusamulticentralestari.com/Uploads/userfiles/files/sisavisonijaxebasu.pdfIn PDF document text
- https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/984a1c759f587e1b84bb877cdb34c3ca/rodopaxikatusoxafuvoriv.pdfIn PDF document text
- https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/g2d0ab6bq07ggbkd2t1a08i1nq/xowumevejenifufijogopuz.pdfIn PDF document text
- http://dges.in/userfiles/file/9553254042.pdfIn PDF document text
- http://icltindia.in/userfiles/file/zibolajurasudojen.pdfIn PDF document text
- http://lideparts.com/userfiles/file/1623005357.pdfIn PDF document text
- https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/72510826951.pdfIn PDF document text
- https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/ff6dc61963eece8b0dec5b8f2ad0885f/70739407970.pdfIn PDF document text
- http://fogathajtohirek.hu/fckfiles/file/lefililubululanirixiru.pdfIn PDF document text
- http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607add0c8bbc1---tomaluzufafu.pdfIn PDF document text
- http://casinodanmarkjackpot.dk/userfiles/file/89002788516.pdfIn PDF document text
- https://electrabicycles.pl/app/webroot/uploads/file/16249685540441.pdfIn PDF document text
- https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bb571e1a0---makozufe.pdfIn PDF document text
- https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/f28cee91118379573a352bb206e4bd38/tidolijanetunub.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=retroarch+mame+core+missingPDF 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_off0000e71b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE71B	17800 bytes
SHA-256: `4047252f34964cbadc9a5c7e06413ef33761a7af9c282fbde2408d07c5a7abaf`
`font_01_sfnt_off00011657.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11657	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012e6e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E6E	10676 bytes
SHA-256: `1a175fbf5bf99c7f0a6fa42f65190033c29f11dadc945a34801d6ba82cb40477`

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