PDF malware analysis — malicious · bb438882d8bf30a0

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 22:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: 7af6389a51c5456a595e5cd951004e41 SHA-1: 50865082eec8ccbce0f7d7c003148869aa37ab97 SHA-256: bb438882d8bf30a0f1837931340029ee5e90f324c4f6a4ad9418eaffb086fa14

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and a visual download button, indicating a social engineering attempt to trick the user into downloading a malicious file. The numerous embedded URLs, many hosted on compromised sites, further support this phishing and malware distribution vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9919

Heuristics 7

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0382e918d---88934004594.pdf In PDF document text
- http://zonazero.es/userfiles/file/zamerokewesapital.pdfIn PDF document text
- https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcc5c40e57---81645151243.pdfIn PDF document text
- https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609095657951c---8210650726.pdfIn PDF document text
- https://qnzar.com/files/74581922103.pdfIn PDF document text
- http://zrdb-drogbud.pl/Upload/file/15138483137.pdfIn PDF document text
- http://iphonedown.com/ckfinder/userfiles/files/fusapomixamitexerisorixu.pdfIn PDF document text
- http://sosnovgeo.ru/userfiles/file/sudore.pdfIn PDF document text
- http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a64a957b5c---83162652961.pdfIn PDF document text
- https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/114a4a428ab462cd725c0b8d58b48110/kerufixotixebolebaw.pdfIn PDF document text
- https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/f1e817b5557c874682b36c38560873fa/paretopisadimulid.pdfIn PDF document text
- http://zafirkort.com/uploads/files/4251965164.pdfIn PDF document text
- http://xn--aknmedcal-wpbe.com/uploads/file/51697575341.pdfIn PDF document text
- http://alibabashipping.com/userfiles/file/84958331360.pdfIn PDF document text
- https://travelstore.tn/userfiles/file/mival.pdfIn PDF document text
- http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a0c3813cd---zagukijovuziri.pdfIn PDF document text
- http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/g9epd77dc48lb8vcqbchht0af7/50293867450.pdfIn PDF document text
- http://grupafurman.pl/!mag2011/userfiles/file/mumuvipesumagelub.pdfIn PDF document text
- https://iqmuseum.mn/uploads/files/11885767592.pdfIn PDF document text
- https://ranagro.com/files/3234007183.pdfIn PDF document text
- https://aprenda-atdi.com/uploads/files/24028506404.pdfIn PDF document text
- http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/notikuvamebowulitubi.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6b0027725---28904059306.pdfIn PDF document text
- http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160fdc640c88bc---foberalob.pdfIn PDF document text
- https://yocarbroker.com/upload/ckfinder/files/xoxiserez.pdfIn PDF document text
- http://morgancountyoh.com/userimages/29248589110.pdfIn PDF document text
- http://aotwcasino.com/ckfinder/userfiles/files/lobogowuvewibozutefuwuben.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=mastering+drawing+the+human+figure+from+life+memory+imagination+pdfPDF 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_off0000d339.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD339	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000eb50.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB50	11236 bytes
SHA-256: `bef9322e1d1e4ea97ce92cfa234f552c77f5b75e249e5a7e7d1f88e37e5a2d45`
`font_02_sfnt_off00010550.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10550	20700 bytes
SHA-256: `17caf10e92ef35cf334fae9cd4de9c9df664e582f83d1bdb84dad6afc8733b59`

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