PDF malware analysis — malicious · a255d9edb3651d91

MALICIOUS

PDF

80.4 KB Created: 2021-09-11 16:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 2927f3ce630c4e5e71fa36d3f9b95d3f SHA-1: 79cf58559edf248205e17a3a0bb74e89b1881f5a SHA-256: a255d9edb3651d91fdc665995da4928d96cd8df3f45e3df4f0bf1e3fcd8a94b7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded links are consistent with spearphishing attachments.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://drafthe.ru/uplcv?utm_term=accessibility+mode+android PDF link annotation
- http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613427e017a82---vunivebosujelowizuguw.pdfIn PDF document text
- http://tasteofruraleurope.eu/upload/File/2873001695.pdfIn PDF document text
- http://badischer-kunstverein.de/ckfinder/userfiles/files/62460994015.pdfIn PDF document text
- https://akanaymatbaa.com/calisma2/files/uploads/buvilunupijawififozimapuz.pdfIn PDF document text
- http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161316a117b43a---wuwit.pdfIn PDF document text
- http://nickels.design/ckfinder/userfiles/files/47068443764.pdfIn PDF document text
- http://wjcopy.com/upload/files/20160046950.pdfIn PDF document text
- http://ottomaniantextile.com/userfiles/file/wapivewabakade.pdfIn PDF document text
- https://bywuf.org/upload/editor/files/lumejiz.pdfIn PDF document text
- https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/ff4e4018fd58e1e827af331e5ef2c153/80948881475.pdfIn PDF document text
- http://kaztelcom.kz/ckfinder/userfiles/files/kusowafufuniv.pdfIn PDF document text
- http://tiendanatacion.com/noticias/files/25015940201.pdfIn PDF document text
- http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f697e04611---79632656856.pdfIn PDF document text
- http://coeb.eu/userfiles/files/molijotibagavulidugelovir.pdfIn PDF document text
- https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/48608710865.pdfIn PDF document text
- https://holcom-wd.holcom.vn/webroot/img/files/valuduzegumepixexadexofu.pdfIn PDF document text
- http://honeycontacts.com/uploades/userfiles/file/81329402244.pdfIn PDF document text
- http://dinhviht.com/images/newtech/files/37541101346.pdfIn PDF document text
- http://duancanhotot.com/upload/files/tidiguxojegesozexetaka.pdfIn PDF document text
- https://mediaskills.rs/files/4395069212.pdfIn PDF document text
- http://blackhorsesc.pl/userfiles/file/genaja.pdfIn PDF document text
- https://uleshuzataruhaz.hu/files/file/15993679587.pdfIn PDF document text
- http://aptekainternetowa.net/_mdm_apteki/file/rezamewe.pdfIn PDF document text
- https://calienglish.com/ckfinder/images_store/files/87410493180.pdfIn PDF document text
- http://boothbayharborshipyard.com/userfiles/file/5890504767.pdfIn PDF document text
- http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613093dd3f4e8---39932556738.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_off0000d78e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD78E	16728 bytes
SHA-256: `1c265cc724a444020da24f684f66fe67c4375d66789b8b3817d383d2b954cd6a`
`font_01_sfnt_off000102e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102E2	10764 bytes
SHA-256: `5f765c17a334ed1d33e1fe3fc7bd142e809e42c587ec41a5d0582460dd049ab9`
`font_02_sfnt_off00011bac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11BAC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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