PDF malware analysis — malicious · d2af6c45ac9d7eb8

MALICIOUS

PDF

73.8 KB Created: 2021-09-08 21:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: a89afcb20cc4a0fc33816a4ef5a46c6e SHA-1: f0c06ae605c09a24c9dc79ba901776ddea11f808 SHA-256: d2af6c45ac9d7eb8d7545befbbe90982cd62188c69b16e4966d7bed40e06e1e5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign. No scripts were extracted from this sample, but the PDF structure itself is designed to lead users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9907

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://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/349bc32e4abfaf2ea68eb9e3ce10e2d4/91653321846.pdf In PDF document text
- http://gsprojekt.eu/userfiles/files/80890573776.pdfIn PDF document text
- http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134cea0c47c5---28123235511.pdfIn PDF document text
- http://vibestedu.com/_UploadFile/Images/file/62035327624.pdfIn PDF document text
- http://xn--4k0b43gkwo4gn.com/upload/editor/file/90296106843.pdfIn PDF document text
- https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/vtldm70b4sjagf7d8qrr9mhjge/disalalejalupaxuro.pdfIn PDF document text
- http://silarperu.com/UserFiles/file/55865556518.pdfIn PDF document text
- https://cambodiadriverservice.com/userfiles/file/rizifuvejeresozejawepula.pdfIn PDF document text
- https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/29cc3eacd0871af83779cbc2515683be/15841992185.pdfIn PDF document text
- https://textmakareknutsson.se/upload/image/42651116947.pdfIn PDF document text
- http://jayeonrak.com/upfile_editor/2021/files/tijuwetezu.pdfIn PDF document text
- http://gdlejia.com/uploadfile/files/20210902_065111.pdfIn PDF document text
- https://equinox-e.com/upload/UserFiles/file/40442847655.pdfIn PDF document text
- https://highlander-inn.com/assets/userfiles/files/55232700422.pdfIn PDF document text
- https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/i13qm5co4315ksuj5onfv2gjmi/90171930654.pdfIn PDF document text
- https://trongtrucsolution.com/uploads/files/rutiritikijoxin.pdfIn PDF document text
- http://snailgame.ru/upload/files/20210904054816.pdfIn PDF document text
- http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/41043709124.pdfIn PDF document text
- http://kasand.com/userfiles/2733661035.pdfIn PDF document text
- http://musicandyouapp.com/webupload/editorimg/files/6199551007.pdfIn PDF document text
- http://abcbyspu.com/ckfinder/images_store/files/setikevubupazilefokisake.pdfIn PDF document text
- http://etasystem.net/userfiles/files/putoxixeb.pdfIn PDF document text
- https://b2bircruise.travflex.com/bot/ckfinder/uf/files/lobojutetizo.pdfIn PDF document text
- https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/03ad28b86c4fbd2c7c73025cad0c42f5/1633136991.pdfIn PDF document text
- https://bbox.ru/images/shared/file/mutaputuradikogopifem.pdfIn PDF document text
- http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138ef4a6314c---28238690368.pdfIn PDF document text
- https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357c57940b2---53771372608.pdfIn PDF document text
- https://bisleri.genefied.co/ckfinder/userfiles/files/59524561710.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=nanometrics+centaur+manualPDF 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_off0000bc30.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBC30	17392 bytes
SHA-256: `950004c86a32db8e53c00c333a74dc2711d85b505349cddf8223ab8e2ebad1a4`
`font_01_sfnt_off0000e88a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE88A	10468 bytes
SHA-256: `230a47df474cd995e8b15d6614c3cbc2943b9ef58e0352ec2759d53bb5b08494`
`font_02_sfnt_off0001004d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1004D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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