PDF malware analysis — malicious · d96024c6c12eede9

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 02:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 3b28898a66daceacf30eddd1ef80fb07 SHA-1: a4fd9227b691fcd0b99045c39f5317821b46432e SHA-256: d96024c6c12eede90b264af513770d76667790fa11c718d8b6beee3a06fb79be

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. These links likely serve as lures for phishing attacks or to download further malicious content. No scripts were extracted, but the structure suggests a phishing or redirection attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=best+movie+downloader+app+for+pc PDF link annotation
- https://processwork.archerhuang.com/ConImg/files/47481882775.pdfIn PDF document text
- https://breedlife.com/upload/files/pozepelilaxurilufaja.pdfIn PDF document text
- https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16143b3c7b97a6---4376762562.pdfIn PDF document text
- http://tongshengchem.com/ckfinder/userfiles/files/gukojegeviragetajinegepe.pdfIn PDF document text
- http://gpsputhuppally.com/userfiles/file/nopavuvivopolivibubixi.pdfIn PDF document text
- http://52fotki.ru/ckfinder/userfiles/files/jupidevi.pdfIn PDF document text
- http://chanhbon.vn/media/ftp/file/5103616511.pdfIn PDF document text
- http://safiorida.nl/operatori/userfiles/file/91719364347.pdfIn PDF document text
- https://angkalaris.com/contents/files/87582296155.pdfIn PDF document text
- http://vesimport.ru/userfiles/file/patixagezogabu.pdfIn PDF document text
- http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133665880b25---1962233395.pdfIn PDF document text
- https://smg.bid/ckfinder_userfiles/files/21936122068.pdfIn PDF document text
- https://alistairmills.com/ckfinder/userfiles/files/4126408206.pdfIn PDF document text
- http://japan-railpass.info/images/blog/file/tewajegakadoxoboko.pdfIn PDF document text
- https://nacituran.com/userfiles/file/ruxemilupuni.pdfIn PDF document text
- https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/2639802956.pdfIn PDF document text
- http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d42d09b03---midesaxawodebabireve.pdfIn PDF document text
- https://10playsolutions.com/clients/softklk/documents/_articles_/file/lajalarutawu.pdfIn PDF document text
- http://smflow.in/admin/uploads/file/rerefodolunewukexa.pdfIn PDF document text
- http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31260680835.pdfIn PDF document text
- https://iwanbim.iwan.co/userfiles/files/vumapejisadotidekipujeba.pdfIn PDF document text
- http://zeshengtecphar.com/UploadFiles/FCKeditor/20210912003420.pdfIn PDF document text
- http://topbuild.net/content/xuploadimages/file/godiviminupin.pdfIn PDF document text
- https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/l3umrt2ikn8e8chidb064r2nkt/39501900601.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_off0000df69.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF69	10984 bytes
SHA-256: `eb4995c890a02f028ee197b482382761ed05433b91c61bccabd638470e42255a`
`font_01_sfnt_off0000f8fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8FE	18096 bytes
SHA-256: `d1b328a887783bbdeca09a6c4d3c5a2a7740b0a87dee1dd424dfcfc2d6b18462`
`font_02_sfnt_off00012743.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12743	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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