PDF malware analysis — malicious · b00721c942db8a56

MALICIOUS

PDF

88.3 KB Created: 2021-09-06 15:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: c96827770b1563af464688216adb9254 SHA-1: 7b36b38acbd2aee4ed54fb913b35dec495f27091 SHA-256: b00721c942db8a5615fd90e5a8e7a717e29d28ce34a3b4624c2b5fee489e79f0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and does not provide clear textual lures, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://purofirstli.net/userfiles/file/tekakok.pdf In PDF document text
- https://retrofitoman.com/ckfinder/userfiles/files/158638172.pdfIn PDF document text
- http://kahounova.cz/userfiles/file/tagemelinajire.pdfIn PDF document text
- http://beamstraffic.ae/amb/userfiles/file/39560220236.pdfIn PDF document text
- http://xn--kprq5pvqklteonubj6c.tw/CKEdit/upload/files/rafobix.pdfIn PDF document text
- https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612a292cbef40---xubijegubu.pdfIn PDF document text
- https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160800a8a78278---98629808581.pdfIn PDF document text
- https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fd968558e---fibudojoruzukeparoxatifo.pdfIn PDF document text
- https://aquatrustfina.com/userfiles/file/wovuwojafafadebusima.pdfIn PDF document text
- http://helder-effect.nl/userfiles/file/mokebuvozemipimiwox.pdfIn PDF document text
- http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/stbjd3095tmmc85hjfb242ckj1/27008013154.pdfIn PDF document text
- https://zlato-eu.sk/upload/files/76146540958.pdfIn PDF document text
- http://ballarioarchitetti.eu/userfiles/files/jafiriwopotifu.pdfIn PDF document text
- https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/3qbs2pargjnnlk2mcqfiiif2jp/selujanise.pdfIn PDF document text
- https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/079979b98c057afbac4d78e01106e555/riwofiwakefavopujepu.pdfIn PDF document text
- http://beiwendq.com//data/attachment/file/wimisutumujukuve.pdfIn PDF document text
- http://anatolianlgs.com/userfiles/file/47814240103.pdfIn PDF document text
- http://diversecityuk.com/userfiles/file/vonud.pdfIn PDF document text
- http://erdbau-rauch.at/24511505525.pdfIn PDF document text
- https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/7be283cb08d12a0d97f81252c8eb69ed/nonoki.pdfIn PDF document text
- http://funagamex.vn/PhuongNamGroup/userfiles/files/74043619693.pdfIn PDF document text
- https://morethancars.eu/uploads/edytor/file/sategupegunavovevenod.pdfIn PDF document text
- http://gardens-spa.com/user_pict/file/81397154957.pdfIn PDF document text
- https://taptigrihnirman.com/singhania/downloads/file/miwekevesotala.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=scottish+snare+drum+rudiments+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_off0000f2d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2D7	18112 bytes
SHA-256: `dabb827df68bfc7e403a201918eb972059e56eb166378be60295734f126d00c1`
`font_01_sfnt_off00012203.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12203	11016 bytes
SHA-256: `40e4179ebd6a098e1c6d68bfe63913fa83fbb0f21028bcae8c4be88c776981fc`
`font_02_sfnt_off00013b6a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13B6A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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