PDF malware analysis — malicious · f27162e4c3196489

MALICIOUS

PDF

71.8 KB Created: 2021-09-03 02:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: ec7cdc3ec5ed6c904c066a1ea406798b SHA-1: d83c790cd1027dcbe5887afee0967c47f2975741 SHA-256: f27162e4c3196489535dbb20e229a20b236b9e8e1760c94bd995354f15384dea

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. Heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's used to distribute further malicious content. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/88nktg0tnc5ebkro00k0tbo13p/zegimakesoxafutobetidov.pdf In PDF document text
- http://savages.lu/imagesRTE/files/11887662441.pdfIn PDF document text
- http://jiendurancecoaching.com/ckfinder/userfiles/files/22359189013.pdfIn PDF document text
- http://cnhhgj.com/upfiles/userfiles/file/xirevuxabasirujinoketijil.pdfIn PDF document text
- http://easyhypermarket.com/userfiles/file/75102314401.pdfIn PDF document text
- http://mosvag.ru/img/lib/file/xatoxirog.pdfIn PDF document text
- https://sharadsangam.org/UserFilesTwo/file/1129158735.pdfIn PDF document text
- http://toanlinh.vn/upload/files/52983494220.pdfIn PDF document text
- https://lesfeesdelhetre.fr/upload/files/51934572199.pdfIn PDF document text
- http://www.jobsincrete.gr/images/_user_na/file/67676183799.pdfIn PDF document text
- http://cc-loges.com/uploads/file/89139575372.pdfIn PDF document text
- https://extremedriveline.com/ckfinder/userfiles/files/gutuzixenawamozodefev.pdfIn PDF document text
- https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f5radj7o8t76p09fb60dfvg704/gakekoje.pdfIn PDF document text
- http://polskienarty.pl/data/aktualnosci_imgs/file/napon.pdfIn PDF document text
- http://mhinflatable.com/upload/file/fakokabeti.pdfIn PDF document text
- https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c7c9df86c---vufudugazozubuf.pdfIn PDF document text
- https://hunde-katzen.at/soubory/zeviwafuwetuvesa.pdfIn PDF document text
- http://tsradviseurs.nl/mailing/images/photo/file/42313904385.pdfIn PDF document text
- https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7975c2005---93212531350.pdfIn PDF document text
- http://am-assets.com/aom/magnolia/userfiles/file/pikunokepupe.pdfIn PDF document text
- https://vnnc.vn/img-hdmedia/files/rafixuvejutuvevet.pdfIn PDF document text
- https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/f96ab7295771486096b8e75bed65d105/2515846719.pdfIn PDF document text
- http://emekyesiltepe.net/images_upload/files/tidukomavu.pdfIn PDF document text
- http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c283af7db9b---91621218331.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=tuning+for+wind+instruments+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_off0000b79d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB79D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cfb4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCFB4	10780 bytes
SHA-256: `db7a6199ff88f3cffa1c8eb9ee52d2dce620ece8e3c11a9624eadb9f33d03ba3`
`font_02_sfnt_off0000e860.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE860	16044 bytes
SHA-256: `b415a74d8bf207041ff3e0f81daaca6da7b2718e7fe8ba841b61cec04272a0d0`

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