PDF malware analysis — malicious · 788580ee730aa59a

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 10:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 6c3884e23df5d93f1ad7a12d2993e5e0 SHA-1: 9ce5c6a5302414932ce7198e721439de65ae5edd SHA-256: 788580ee730aa59a8d81cff29695412048c239620f3d59b46a30b457820e92eb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of embedded URLs indicate it's intended to lead users to malicious external content, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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://philabc.ru/uplcv?utm_term=system+test+plan+example PDF link annotation
- http://eco-versute.com/app/webroot/ckfinder/userfiles/files/20903414476.pdfIn PDF document text
- http://homeshopeez.com/uploaded_files/userfiles/files/30423011410.pdfIn PDF document text
- https://ceral.pl/ceral/pliki/file/9839781054.pdfIn PDF document text
- http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609893ee5549e---nelutirumejarevovadoke.pdfIn PDF document text
- http://446888.top/userfiles/file/33856661231.pdfIn PDF document text
- https://hydratrend.com/application/third_party/ckfinder/userfiles/files/6533307637.pdfIn PDF document text
- http://leadershipcareer.kr/fckeditor/_upload/file/tapuranonolegamekubake.pdfIn PDF document text
- http://beta-rc.com/upload/files/20805785402.pdfIn PDF document text
- https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097fdfe4125f---xuguwuremaxid.pdfIn PDF document text
- https://sabunwangi.com/contents//files/pofelazozovinobesimodele.pdfIn PDF document text
- http://thepducphat.com/upload/files/74368340693.pdfIn PDF document text
- https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942d359f8d0---13118074427.pdfIn PDF document text
- http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6590441461---nuroxale.pdfIn PDF document text
- https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/cadad157180fb44a14c6da8a40468485/80826461138.pdfIn PDF document text
- https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/79eecd8eec4374cd6b036e2b0926ba61/2947540494.pdfIn PDF document text
- http://zonwering-nederland.eu/ckfinder/userfiles/files/rizafifedonufurevix.pdfIn PDF document text
- http://marklaliberte.com/fckupload/file/15497213698.pdfIn PDF document text
- https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d77e2f6c66df3a52da6673f3fc68c84c/veminuvavitexavutovul.pdfIn PDF document text
- https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/9cf8de0f339767b0d7b4446336a76604/misipufozusivakixige.pdfIn PDF document text
- http://otczenacts.com/media/files/85218217330.pdfIn PDF document text
- http://suachuaspa.com/upload/images-content/files/wazuwubavi.pdfIn PDF document text
- https://kolkataangikar.org/ckfinder/userfiles/files/xixik.pdfIn PDF document text
- https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/52577fa13b0c807f22b0a84e58117f76/29000937836.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5rf71iv68iek1lp8lcghm33qb8/39406623007.pdfIn PDF document text
- https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/e68695ea15fd1d72b0d5ed8029cccdd9/bonulumobepigekegiged.pdfIn PDF document text
- http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c7b460cc8---kivebavoviputukudul.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_off0000e505.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE505	18068 bytes
SHA-256: `4945c39ddc1a43d93cfeb4b0503e064bbacbeb96c6efe3b87e4df10d2fc51f8a`
`font_01_sfnt_off00011449.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11449	10392 bytes
SHA-256: `4bca830356246b8940adc7f640dffa69356bc221d5cab75180bfba9405d1e603`
`font_02_sfnt_off00012bdc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12BDC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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