PDF malware analysis — malicious · 29657e6833beb836

MALICIOUS

PDF

92.4 KB Created: 2021-08-04 10:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: c4f64447ff3dd9c0741d1acbc5a5f230 SHA-1: 7258b489e7c945397a8718d993deb56a143ca4de SHA-256: 29657e6833beb8362cf8927d9748ae738b8d57898b36c083533a2cccb28b09fc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised CMS uploads and disposable hosting. The document body is unreadable, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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 http://dzstock.com/Upfiles/file/pejab.pdf In PDF document text
- http://fecoil.com/userfiles/file/jiwojewebufuroparesoz.pdfIn PDF document text
- http://hysansam.com/fckeditor/userfiles/image/naborusubuna.pdfIn PDF document text
- https://pernambucoimortal.com/imagens/files/mubozugusasunu.pdfIn PDF document text
- https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/cemo87lh9oc2qhkvh2pjolbbr0/77421467573.pdfIn PDF document text
- https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/e983vobr6vsh3871hq214fou8j/15733091391.pdfIn PDF document text
- http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/5ec8d2171d965bf8e9d4f92f2764495d/vuzudosedu.pdfIn PDF document text
- http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874245ed4f9---dobesebetojefivif.pdfIn PDF document text
- https://tootooair.com/FileData/ckfinder/files/20210616_9D8D46776B08F3D3.pdfIn PDF document text
- https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081ba0592766---83866238350.pdfIn PDF document text
- https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/900862a2250b60d388cab9033c84aacb/vopepukanesone.pdfIn PDF document text
- https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c35f891309f---75447158735.pdfIn PDF document text
- http://sushiloverca.com/uploads/files/devosavozona.pdfIn PDF document text
- http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6a50c7ffb---98664642879.pdfIn PDF document text
- http://ccswcd.com/userfiles/file/libovuso.pdfIn PDF document text
- https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/660bc63fa6dee33ba65af0764351b34d/41923019848.pdfIn PDF document text
- https://parklanehotel.asia/userfiles/file/kugolebejezowobeferuxazex.pdfIn PDF document text
- http://spalovnachemolak.sk/userfiles/file/zitogifowuvebuwowemezugit.pdfIn PDF document text
- https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa5a36aa66f2c070f69f8b5c1cf58121/60347776672.pdfIn PDF document text
- http://savvyais.com/userfiles/file/nujawisuzejapita.pdfIn PDF document text
- http://biswasi.com/userfiles/files/34826340821.pdfIn PDF document text
- http://burchiellati.com./file_fck/file/44564092211.pdfIn PDF document text
- http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac9951b30---44641329876.pdfIn PDF document text
- https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/lm0mgsjgvkje4u481khkq9j57q/ganokuxinusagupiso.pdfIn PDF document text
- https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c823260b24---30220960879.pdfIn PDF document text
- http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bd49cd8719c---1018323169.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=division+de+una+cifra+para+ni%C3%B1os+de+tercer+gradoPDF link annotation
- 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_off0000ff98.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF98	18616 bytes
SHA-256: `34fba8fc310931063ddc41702d1fbb4e536b2450e5e4e34aded5a231f0c8efcb`
`font_01_sfnt_off00012f97.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F97	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000147ae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x147AE	11120 bytes
SHA-256: `12f5947893a51ca26c4435a1a4695879f12ac88ab33af15a665e402f890dbc83`

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