PDF malware analysis — malicious · b831cb3ba54a6254

MALICIOUS

PDF

89.6 KB Created: 2021-06-30 01:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 127d54be120e5598e6fd96f16d008a1c SHA-1: 817647ca3768b6560e258691b9494978ecb424be SHA-256: b831cb3ba54a62547b48ee8ca6460a57077a7b5db0d59ce94d33c6c8000aa5f8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

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 http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfd8409f33---saruzesozepuva.pdf In PDF document text
- https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077444f25da3---davupeteposopijorivodela.pdfIn PDF document text
- https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/rnali0lv66bg0ur6kbs776njm2/risekevifarosuwuwa.pdfIn PDF document text
- https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e163149db2b0851352445b0963ac0b9e/valojejixoz.pdfIn PDF document text
- https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/7f916891d0c39771918b9204c748766b/89884473903.pdfIn PDF document text
- https://acrgroup.nl/userfiles/file/ripagulosifibemamo.pdfIn PDF document text
- https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/8cac04c1cb51a586ad121a2d2c5aac99/xobevugina.pdfIn PDF document text
- https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/vnrk9k2g92s5f5o96el573n2b5/parulegarumivenubexofal.pdfIn PDF document text
- http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31f2e5c335---48852836104.pdfIn PDF document text
- https://gawwaclsc.com/app/webroot/upload/files/ruviwazigafitatepigufetav.pdfIn PDF document text
- http://jnnycc.org/userfiles/file/5489915001.pdfIn PDF document text
- https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609447760ede6---jilaba.pdfIn PDF document text
- https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/2d0bb2ba9ed88764948d127fd625e07b/67978849355.pdfIn PDF document text
- https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b9872a382---mitaxidujepafe.pdfIn PDF document text
- http://tecresconsolidamentorestauro.it/fck_data/file/3337032125.pdfIn PDF document text
- https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/jk9du6ia2f5fsvjd5o2bc6il2r/nikobobug.pdfIn PDF document text
- https://pensiunea-escape.ro/ckfinder/userfiles/files/6445484232.pdfIn PDF document text
- https://producedepot.us/userfiles/files/91958026711.pdfIn PDF document text
- https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/n5hmmcj0jvp7b024f4vvj9m6q6/60180222919.pdfIn PDF document text
- http://csc020.com/userfiles/file/20210630052327_rgjasv.pdfIn PDF document text
- https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/f01d4eeb87eab732f1a3de97e844d987/40549502962.pdfIn PDF document text
- https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/e57cf77a1cd80ed5780bfc813c24bf45/wokesumuzizipot.pdfIn PDF document text
- https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/8f2e183e9655b89cac8ad19084de0cd9/54547179694.pdfIn PDF document text
- https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/86037643295.pdfIn PDF document text
- https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/cf692393b1dd22ca880b7cdd68e6a94a/54526031823.pdfIn PDF document text
- https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/5a0hb0dklha6404t9lom9btn55/madopuzad.pdfIn PDF document text
- http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160921ce3af192---fudodudukizuzabez.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+density+of+a+materialPDF 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_off0000f53e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF53E	19156 bytes
SHA-256: `5d87a3faab995e2d6b86a44e7671956bbe038887b27af00786d2c969dde4d073`
`font_01_sfnt_off0001289c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1289C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000140b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x140B3	10696 bytes
SHA-256: `a01d3fc804d6f9346c7899ad163012100bb3247c412c35611c75b5b03ce6ffeb`

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