PDF malware analysis — malicious · f79dcb0801a1c761

MALICIOUS

PDF

70.5 KB Created: 2021-09-09 10:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 774dd4993999ac5eca48c06c72b29b8a SHA-1: f6ede8f698b78c8f379563fb8fde2b45d2355643 SHA-256: f79dcb0801a1c761682dad6a09fb57d1bfdaae8320987325a33f0cc88a5af271

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attack pattern involving user redirection to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9950

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://krisoc.ru/uplcv?utm_term=how+to+watch+chaos+walking+for+free PDF link annotation
- https://marjoyunlar.com/calisma2/files/uploads/nopilox.pdfIn PDF document text
- https://repare-ton-smartphone.com/userfiles/file/rudebitajekuzimewoxirezu.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0b1odrqu4ofi00uf5ud76h9do4/fiwusemit.pdfIn PDF document text
- http://thedewakohchang.com/image/upload/File/ijuramem.pdfIn PDF document text
- http://heathrowairporttaxi.website/userfiles/file/zapozuzofuruma.pdfIn PDF document text
- https://lhorizon.ca/uploadHorizon/file/32332865806.pdfIn PDF document text
- http://enidental.com/userfiles/file/20210902054603.pdfIn PDF document text
- https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613565a0abaf3---25651979597.pdfIn PDF document text
- http://zhongjiukeji.com/upload_fck/file/2021-9-4/20210904210832790864.pdfIn PDF document text
- http://gbfrjournal.org/pds/userfiles/files/tipifaxovit.pdfIn PDF document text
- http://gaytonfa.com/upload/files/bupowamapalidapexokoru.pdfIn PDF document text
- https://happy-playground.gr/uploads/_uploads/files/85445513077.pdfIn PDF document text
- http://happysmilecard.com/uploads/files/weminixeja.pdfIn PDF document text
- http://kamienneogrody.com/userfiles/file/beripukituwagaz.pdfIn PDF document text
- https://rossbeede.com/userfiles/file/25935113408.pdfIn PDF document text
- http://dalnoboy.org/data/filestorage/upload/files/wikowepad.pdfIn PDF document text
- http://artdealer.vn/upload/fckimagesfile/a880444f36111ee4c1541f094349b214.pdfIn PDF document text
- http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/weberuroxebivelibavol.pdfIn PDF document text
- https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/f07ca6c612191214500ea9416cfaca3d/suxejudade.pdfIn PDF document text
- https://stiglic.sk/userfiles/file/joxexorufot.pdfIn PDF document text
- http://focalthai.com/file_media/file_image/file/wuwavizebobi.pdfIn PDF document text
- https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161332cbf1e21c---15624311854.pdfIn PDF document text
- http://meruzhankhachatryan.com/app/webroot/files/file/96143145171.pdfIn PDF document text
- https://yukkumpulgroup2.com/contents/files/92992511517.pdfIn PDF document text
- https://elegune.net/files/galeria/files/35583440534.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_off0000b1cc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB1CC	10784 bytes
SHA-256: `c0c5b5e64087d46ea40a85080cee79090a5bc5ef0f6990fa0aa1c551b5fd21e0`
`font_01_sfnt_off0000caa2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCAA2	15524 bytes
SHA-256: `b2ef41b40b43ffdc2bef5826b41b01cf2539d029ae17b651b5db9a3e5275becd`
`font_02_sfnt_off0000f2ac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2AC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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