PDF malware analysis — malicious · fdb497724af77854

MALICIOUS

PDF

85.7 KB Created: 2021-09-20 17:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 8f762ca62d16751014c36031c5c0ede6 SHA-1: bce6c43955d84fc4a6b21dc30996d9846a17943e SHA-256: fdb497724af7785480da22b642cf75850cd85331b862fa7b8711a0f052909aa1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=flash+app+android PDF link annotation
- http://dsagco.com/Upload/file/33078896208.pdfIn PDF document text
- https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16133c28b7a518---85337273026.pdfIn PDF document text
- https://luminex.pl/upload/file/99890927359.pdfIn PDF document text
- http://lyzjkgm.com/d/files/87807732914.pdfIn PDF document text
- http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/198572d2b6fb22f74cf0aabb479dea38/xifuxumebaz.pdfIn PDF document text
- http://rrmkaryacollege.org/rrmkarya/userfiles/file/6852873572.pdfIn PDF document text
- https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/44fa7fe28833f34957745477c27476d8/dovevisujosapelufopanuw.pdfIn PDF document text
- http://razaviota.ir/basefile/razaviotair/files/junikixixo.pdfIn PDF document text
- https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4809749ad---18144307654.pdfIn PDF document text
- http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9150086636.pdfIn PDF document text
- http://seoulmenu.com/uploads/files/6609232014.pdfIn PDF document text
- http://studiocariola.com/userfiles/files/75463572210.pdfIn PDF document text
- http://farmaciafasolis.eu/userfiles/files/87014998385.pdfIn PDF document text
- https://vrrc.heart.net.tw/ckfinder/ckfiles/files/faposejubupo.pdfIn PDF document text
- https://needletherapy.eu/upload/file/vezixutaxowasoxal.pdfIn PDF document text
- https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/39e92b1bdf059ba9a64ccbf4a9aaff12/nomigunu.pdfIn PDF document text
- https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/3dfa56da70c65f758ecc4ac61cafacdf/84651495087.pdfIn PDF document text
- http://archiw.bibliotekalesmierz.eu/img/upload/files/61337465955.pdfIn PDF document text
- http://jdjcnc.com/upfolder/e/files/20210916140859.pdfIn PDF document text
- https://swaarm.de/app/webroot/upload/files/32598319840.pdfIn PDF document text
- http://cnokorea.com/userfiles/file/nupitagiwalerilogoninad.pdfIn PDF document text
- https://haruhonpo.com/upload/haruhonpo/files/20287867576.pdfIn PDF document text
- http://dailycan.com/userfiles/files/63517714359.pdfIn PDF document text
- http://marathon-gexin.com/Uploadfiles/files/navowaditavanazoji.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_off0000ee0d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE0D	17180 bytes
SHA-256: `21db7f281234846a9c6019b84a1a06f2e11bd350134369963e4fb39f8daf4e40`
`font_01_sfnt_off00011a64.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A64	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001327b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1327B	10236 bytes
SHA-256: `4ce835f474102b347839eb6430a570b046a1ecafceda42a56946b304eed1b8f5`

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