PDF malware analysis — malicious · f79d1eced3668b42

MALICIOUS

PDF

81.9 KB Created: 2021-07-29 12:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 4be7be0f6e793c28485bf0bf19d633dc SHA-1: 17919865b3efc147855d2220279eecb642b4a54a SHA-256: f79d1eced3668b427cbdba5c4d2cefb065f204dcbcbf1a678fd2bf2c408a2b68

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of an AcroForm button with an action trigger further supports the malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9932

Heuristics 7

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.
AcroForm button with action trigger low PDF_ACROFORM_BUTTON

PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
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=systems+of+inequalities+word+problems+worksheet+kuta PDF link annotation
- https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/22ad37547fae589798fc9f8bcf487cd7/kawale.pdfIn PDF document text
- http://odpadykj.cz/UserFiles/File/65999288943.pdfIn PDF document text
- https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a172682c0---zowijegas.pdfIn PDF document text
- https://chinese-wall.tw/upload/files/61960758991.pdfIn PDF document text
- http://bertrandetgastineaudesigners.fr/userfiles/file/4550495036.pdfIn PDF document text
- http://keyflounge.nl/userfiles/file/fofibodojebi.pdfIn PDF document text
- https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/5faa55105d9f00405906e9c10fcf6e70/niworaxobedifelejadugebi.pdfIn PDF document text
- http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/bevufetamaxu.pdfIn PDF document text
- https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/hcos50j4sh2b2sn3rtufia9bm3/8062468477.pdfIn PDF document text
- http://thunderstar.cn/userfiles/file/20210722145030740998477.pdfIn PDF document text
- https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075525953c68---11637678711.pdfIn PDF document text
- https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/94581ff123b85ca03ee13a93824e3bc6/622346799.pdfIn PDF document text
- http://karmand24.ir/basefile/ehotel724ir/files/kudabiwit.pdfIn PDF document text
- https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2861dcd92---pufexubepeledosimolidoru.pdfIn PDF document text
- http://yaqeen-eg.com/userfiles/file/xegopiw.pdfIn PDF document text
- https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87a65c2b12---xatabam.pdfIn PDF document text
- https://vokalensemble-vocembalo.ch/userfiles/file/ramoletojepifefafasigajij.pdfIn PDF document text
- http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082de596b3fc---nozawudotogerofiwezuxu.pdfIn PDF document text
- https://pilot-nav.com/ckfinder/userfiles/files/mitizekalamuvozofite.pdfIn PDF document text
- http://www.polni.si/Images/files/lebulugilokizi.pdfIn PDF document text
- http://upoart.com/ckfinder/userfiles/files/garovovoxovaxosivinix.pdfIn PDF document text
- http://blbr365.com/userfiles/file/1623926749.pdfIn PDF document text
- http://lacasedescaraibes.fr/file/48493924082.pdfIn PDF document text
- http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bf871caaf---vunebu.pdfIn PDF document text
- http://hagelkonzept.de/userfiles/file/26618229077.pdfIn PDF document text
- http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/busonufetipukali.pdfIn PDF document text
- http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862f0f9fcb0---mojazizejonegufuf.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_off0000da01.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA01	16728 bytes
SHA-256: `6016fdf6377ee5ad99c14af146aff2aef1b23cffc79a44140fc89883437e4619`
`font_01_sfnt_off0001058b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1058B	11516 bytes
SHA-256: `845029eaedb559e0702bf82e46e637cdf41e19ca7446f31cf31256230c4d2e70`
`font_02_sfnt_off00012037.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12037	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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