Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff65fac5a7831e0b…

MALICIOUS

PDF

88.7 KB Created: 2021-06-29 21:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08e89845a9a7406a4cfe542a5135904c SHA-1: 35299b65866a68b5db78d0b8a629e5080fe8b64d SHA-256: ff65fac5a7831e0b06244603a1a3aa22083fb63bc3bee51264fa491f61682517
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised or disposable. The document body is unreadable, but the presence of numerous external links suggests an attempt to redirect users to malicious content or phishing sites.

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 http://hndgyl.com/v15/Upload/file/20216221433324425.pdf
    • https://taevlingar.se/images/pages/file/wuwukapajawulaxos.pdf
    • http://amuseonline.com/absite/userfiles/file/86476116128.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb2a858066---8318636115.pdf
    • http://baovevietnam-vnss.com/upload/file/kixugivimifevozaremi.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/9ce7a0f18db2e8137ae876f0e2346af0/24972895587.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca562a9521---36094219571.pdf
    • http://shreejians.com/userfiles/file/kirupojixowobowedorepozu.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f2926299f39ec44c2c658ddceb62e939/fogetusoguzu.pdf
    • http://konditsionery-reutov.ru/upload_picture/file/48780993485.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608417f83fb40---dekokifuzoguj.pdf
    • http://sitoad.com/bbqjoekey/files/202106241738414686.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6d9c70be3---naxidakuwurur.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/mvk5hr5bussk2rj67bjuncmk13/sejiwopuxofobakoraluwex.pdf
    • https://africanresearchcenter.com/userfiles/file/53612492654.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1b05efcfe---zozemimosakodob.pdf
    • http://baraanduliaptti.org/userfiles/file/58170747805.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/c88fc0c9236cc596937b3aee0bb9b654/zezikedenuvobolufejobi.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/ee44891e8f42732d164390daa20b2d1b/kefotasevebaxe.pdf
    • http://aitrans.cn/UploadFile/file/F1202106241909175229.pdf
    • http://villa-carlshorst.de/sites/default/files/file/25615479316.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160763b1d38a9f---pudojojiniwuralulo.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8uisu27m02jn6fi6r2dvsmeeue/27671536672.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608262d80c979---xopuwofikitukogo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=anaerobic+lactic+system
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f92f.bin
7099f1975fa257458390a1f88cf5ec9ce90eaf182abedd256767da54e3054256
pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 10628 bytes
font_01_sfnt_off00011189.bin
3437b2c2b9765f9a2c165632656ad689d34439796f040eafe268226a788aa733
pdf-font-stream PDF embedded font (sfnt) at offset 0x11189 17044 bytes
font_02_sfnt_off00013d9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9D 16792 bytes