PDF malware analysis — malicious · 00a51833f49995b2

MALICIOUS

PDF

88.8 KB Created: 2021-06-27 12:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: df333009ee02b25a3f1b9c25de13ddc9 SHA-1: bc2303267a7b9ea8af290755486c91a2ff77f6e1 SHA-256: 00a51833f49995b289cebeeafbc5922c5ea58b4951ae7d8c8e577c9988305e8e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites, suggesting a phishing or malware distribution scheme. The file's structure and content indicate it's part of a link farm designed to redirect users to malicious destinations.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=how+to+tell+how+are+you+in+spanish PDF link annotation
- https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/9a8af37e951018ecab33ef2cf87ef9b2/rivobufetivebezofilaluv.pdfIn PDF document text
- https://imagebeaute.fr/userfiles/file/60231409038.pdfIn PDF document text
- http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/i0bsmuf4q4ilsnm5ne58afgk20/83587846400.pdfIn PDF document text
- http://iaestedresden.de/userfiles/file/nozatewowuderatipuwadujex.pdfIn PDF document text
- http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adacf13e3ba---lemorenexutod.pdfIn PDF document text
- http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5ba5d1ec3a6ecddf181bdfe241babfe0/65148398672.pdfIn PDF document text
- http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/xekuvimesisepi.pdfIn PDF document text
- http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607841b43329c---vepukuxelabidusera.pdfIn PDF document text
- https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/f59d695da053fb853db1fd639d9d5ead/pafomag.pdfIn PDF document text
- https://vieclamxaydung24h.com/upload/files/82421634491.pdfIn PDF document text
- http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608226f824359---veroxologam.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3h8gg9virainonikipv966s684/saditadojodoti.pdfIn PDF document text
- https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/a64052552467fc81544126ef9946fc5f/sapunafuzu.pdfIn PDF document text
- http://jjinline.org/file_upload/file/lefamixej.pdfIn PDF document text
- http://fields-on-earth.com/77388970980.pdfIn PDF document text
- https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740a352f4f9---gesusubuwovidizozem.pdfIn PDF document text
- http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/5808736608.pdfIn PDF document text
- https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/49bap2spfn819ck0k6ln404ipa/nijefatanimolulamig.pdfIn PDF document text
- https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074f8cf66818---tivativoduwuti.pdfIn PDF document text
- http://www.mostenpo.jp/userfiles/files/43547493287.pdfIn PDF document text
- http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870c1674e95---82715829682.pdfIn PDF document text
- https://hiddencliff.kr/FileData/ckfinder/files/20210603_FF8BACF40D180743.pdfIn PDF document text
- https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/07b4dfd6eee153e8c66e8eca28d01cc1/2336028755.pdfIn PDF document text
- http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16073af89c145e---segufudegifuwojiwopa.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_off0000f4e9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4E9	18672 bytes
SHA-256: `1a28b5370d913f0deb75723386cdfafaa1b7c4cc9e7dc9a48c73198ce74c983d`
`font_01_sfnt_off00012548.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12548	10640 bytes
SHA-256: `d627b9b23d0bd38372a3fa205a359e1d505cc3f2155b049475a913f30884bda4`
`font_02_sfnt_off00013da3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13DA3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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