PDF malware analysis — malicious · b3e6d9b72355224c

MALICIOUS

PDF

87.3 KB Created: 2021-09-11 11:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: cd4543654c26b40a38a21454123b8c0a SHA-1: 115ce76bb8a772626e59517d43d8eff58078ba10 SHA-256: b3e6d9b72355224c34687624a74430c3582277ba11e5676defd02fbc0ef4b921

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection of 'Pdf.Phishing.Trojan' further supports its malicious nature, indicating it's likely used to lure users to phishing sites or download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9807

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://phoiinnhiet.com/images/uploads/files/48113812040.pdf In PDF document text
- http://oticonshop.net/ckfinder/userfiles/files/serewafujepudiraxubinu.pdfIn PDF document text
- https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/1sk86vq2glnkh3eqb6vc0g3nr3/41738201855.pdfIn PDF document text
- http://6nergy.fr/6nergy/sites/default/user/file/wivufopogazewibidukokudex.pdfIn PDF document text
- http://domingo.hu/ckfinder/userfiles/files/kapusetometamolem.pdfIn PDF document text
- http://manuale.aziendasulweb.it/userfiles/files/xeruvidirijivupugivonin.pdfIn PDF document text
- http://adas-muko.pl/photo/file/41481395768.pdfIn PDF document text
- http://ukrainski-rosyjski.pl/userfiles/file/22260190505.pdfIn PDF document text
- http://kossuthdigisuli.hu/userfiles/file/94472576768.pdfIn PDF document text
- http://dermatologomiguelgallego.com/miguel/fck/file/55972616868.pdfIn PDF document text
- http://thanuyentea.com/ckfinder/userfiles/files/73665514526.pdfIn PDF document text
- https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613793cf1c019---1126659674.pdfIn PDF document text
- http://stagelight.pl/userfiles/files/woweror.pdfIn PDF document text
- https://rkdestate.com/userfiles/file/34235933342.pdfIn PDF document text
- https://wroclaw-effatha.pl/grafiki/file/rafekema.pdfIn PDF document text
- http://whipitleather.com/userfiles/file/famepulovoxetumubotod.pdfIn PDF document text
- https://rowanmkt.com/Uploads/ckfinder/userfiles/files/14549608065.pdfIn PDF document text
- http://dade666.com/userfiles/202109file/2021090414195070554.pdfIn PDF document text
- https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/mdibju293q7jm8du6jo8dmu175/ruvusinemeladi.pdfIn PDF document text
- http://d2dgroup.net/upload/files/43550965430.pdfIn PDF document text
- http://tw-sincere.com/upfiles/editor/files/37843690381.pdfIn PDF document text
- https://quatcongnghieput.com/uploads/files/26331754983.pdfIn PDF document text
- http://hermandadperdon.es/userfiles/file/poxumumivenaga.pdfIn PDF document text
- https://bilalyapidekorasyon.com/userfiles/file/tafaruleleziti.pdfIn PDF document text
- http://canadianrockies.info/files/file/lavozapimenupanoleremu.pdfIn PDF document text
- http://oldmotorsclub.com/files/file/55472269311.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=inventions+reading+comprehension+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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d5b0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD5B0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000edc2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDC2	18368 bytes
SHA-256: `984297381aad52d9f7e52a39a6313d14c542d47696227f6f708d55211bb00723`
`font_02_sfnt_off00011cde.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CDE	16836 bytes
SHA-256: `211097b55cbf1985c25d6955e8b04dca157948ab56e2a5568b5bc4f37b63821b`
`font_03_sfnt_off00013526.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13526	11036 bytes
SHA-256: `907922a84c6a1796f3453faccb29aa3669d237c12e769eef2695bf14f68f37f7`

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