PDF malware analysis — malicious · 825d91eeecf3d07d

MALICIOUS

PDF

89.0 KB Created: 2021-07-01 18:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 7604cbe4b9da874af20747838fa95830 SHA-1: 7f578b20b9c038018871daaa5d8cb1e411c62b27 SHA-256: 825d91eeecf3d07d2098b554e1ca628784c663bfb22e21d0f10eb439cc2a2d39

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, directing users to numerous compromised WordPress sites and other disposable hosting domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the link farm suggests it's designed to lure users to 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://drafthe.ru/uplcv?utm_term=advanced+grammar+tests+with+answers+pdf PDF link annotation
- http://afgventuregroup.com/cfiles/file/xaditejipo.pdfIn PDF document text
- https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/lav70lrbc60eb7m01fjacfuafp/nipedovimobuxaguzokiti.pdfIn PDF document text
- http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807bab67265---gorasup.pdfIn PDF document text
- http://apsara.ru/userfiles/file/nodedamonevewazijaluxab.pdfIn PDF document text
- http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f52f0d5e8---62317624230.pdfIn PDF document text
- http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4c2dd3e1f---38562962946.pdfIn PDF document text
- http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe9259d9da---rosagojewupikemog.pdfIn PDF document text
- http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac521541f52---dutorijekedenazisijero.pdfIn PDF document text
- http://cipetbhopal.com/webimg/files/fosufiw.pdfIn PDF document text
- https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/24814d7046a4c999d68998ede941a15b/91481707064.pdfIn PDF document text
- http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095107930627---fapafigesemopinisib.pdfIn PDF document text
- http://sakuragiramenandsushi.com/uploads/files/68710408124.pdfIn PDF document text
- https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/5372ea1883f65febc99a014fb6f1a0aa/31265536992.pdfIn PDF document text
- http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160d813555034a---40248487914.pdfIn PDF document text
- https://qqhanoman.com/contents//files/liwuzaliketuvezupuzotep.pdfIn PDF document text
- https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/17eb8e237fdc801ae389601649f8d555/64421096494.pdfIn PDF document text
- https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/e9d6dbba7a166f8bbef5af8f513478cf/94979251534.pdfIn PDF document text
- https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/pich8752j7h1epateqra97nvk2/zazaralatupanuzanomoz.pdfIn PDF document text
- https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/8f8dccdc1717984454f3f775244b200a/85440952023.pdfIn PDF document text
- http://msiutilities.biz/documents/tesimuwa.pdfIn PDF document text
- https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/e9c9e25ef93284cc9985d22e7a691e30/47915226787.pdfIn PDF document text
- http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2s5g90vj1nmkr4mtd6vlaerto4/gobifedaviboli.pdfIn PDF document text
- https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/4680548720020dfa95bf9d167ca7dd54/26173063897.pdfIn PDF document text
- https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/f0f58eb339e5490695924a705e95ac7e/12904298182.pdfIn PDF document text
- http://anhbanglaw.com/userfiles/file/tajofuri.pdfIn PDF document text
- 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_off0000f64b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF64B	11032 bytes
SHA-256: `f65f61ae874e8328706bdf439be6c0f040d3d22a4a3fd755a47aa8c4c4c00b49`
`font_01_sfnt_off00010fa7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10FA7	17824 bytes
SHA-256: `42cb5f4f5c0c2a47c66feaa9daa17bde53b1464a983e59a3fb750889cd847586`
`font_02_sfnt_off00013e39.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13E39	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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