PDF malware analysis — malicious · 237bc509d62ded7e

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 05:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 2485a61cf704aa4a42632d64d5eb93ec SHA-1: 3eb15072fe2a7e4fec8a9b9755c1b40f6e126732 SHA-256: 237bc509d62ded7e8cc9912cbe4bf9f61b7052dcbc3b4df4b90715e0e35b157e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports a malicious intent. While no scripts were explicitly extracted, the structure and URL patterns suggest a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=gta+v+fan+made+apk PDF link annotation
- https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/58a1a661875f633376cd5ef49de7dd54/73958359729.pdfIn PDF document text
- https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/2cdbae3c8ac34b7c8d16f9403b598eef/2903925358.pdfIn PDF document text
- http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f997345af---58539171449.pdfIn PDF document text
- http://akkoryazilim.com/userfiles/file/kesogonojekokep.pdfIn PDF document text
- https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302d8623adb---kavubufoxapun.pdfIn PDF document text
- http://dxczx.com/ckfinder/userfiles/files/20210905_161736.pdfIn PDF document text
- https://nepalipublisher.com/ckfinder/userfiles/files/wetofetugulirig.pdfIn PDF document text
- http://bukharaalpharetta.com/sites/default/files/file/najukimazomonu.pdfIn PDF document text
- http://www.civilhospitalpalampur.in/img/uploads/files/1237999260.pdfIn PDF document text
- http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613db88e34ce0---rimalozezevisu.pdfIn PDF document text
- http://monikaknoblochova.com/userfiles/file/95936209137.pdfIn PDF document text
- http://ambartakip.net/belgeler/file/68584907344.pdfIn PDF document text
- https://hse.tw/upload/file/22695251102.pdfIn PDF document text
- https://myarchitect.es/ckfinder/userfiles/files/sigepirezepaxukesigu.pdfIn PDF document text
- https://isuzuphonoi.com/data/dulieu/files/muvupuxuruvukiboj.pdfIn PDF document text
- https://sportuna.be/ckfinder/userfiles/files/92635872230.pdfIn PDF document text
- http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381bfed82c9---18566989548.pdfIn PDF document text
- http://dsacare.com/admin/uploads/file/82840956122.pdfIn PDF document text
- http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b1377c1ed---vofawubatotozajadefaso.pdfIn PDF document text
- https://unitedfightalliance.com/ckfinder/userfiles/files/7663735873.pdfIn PDF document text
- http://hotelrealerimini.it/userfiles/files/82370627193.pdfIn PDF document text
- https://coimbatorepressclub.com/FCKeditor/userfiles/file/85082914094.pdfIn PDF document text
- http://stringquartet.biz/web/images/fck/file/texagimuz.pdfIn PDF document text
- http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335ebbac7e1---jasogezeberesutegune.pdfIn PDF document text
- http://postelezmasivu-brno.com/ckfinder/userfiles/files/81261752983.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_off0000dc08.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC08	10328 bytes
SHA-256: `cce2e1ec816ccd8819dc8b196113b56d8eccd71ec09658cce37a04349e7107f6`
`font_01_sfnt_off0000f35c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF35C	18752 bytes
SHA-256: `4ed9ccb47dc4abc3901875afe0b63c11a36952be76c1524f4f76be35752952f2`
`font_02_sfnt_off0001249a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1249A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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