PDF malware analysis — malicious · f27ee9adda04c817

MALICIOUS

PDF

80.8 KB Created: 2021-08-01 15:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: ac4b55cf9e8d2128ea6d09cbccb2af92 SHA-1: fea2851abc38ab3249a0f873a7321a2e5e98285b SHA-256: f27ee9adda04c81718f0bec5871999649bf1271a4b4dd12d641e1e57aaf3bfc4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9909

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://synerhu.ru/uplcv?utm_term=go+beyond+3+macmillan+pdf PDF link annotation
- http://texmet.pl/userimages/file/xutotisatitobowoxuwudefe.pdfIn PDF document text
- http://torbay.ru/images/uploads/file/34155759419.pdfIn PDF document text
- https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a09a1f8f---seluziko.pdfIn PDF document text
- http://samtle.net/ckupload/files/kifoju.pdfIn PDF document text
- https://perfecthospital.org/ckfinder/userfiles/files/5316978375.pdfIn PDF document text
- https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609c67e624732---86942629780.pdfIn PDF document text
- http://aquatherm-graz.at/files/84151857633.pdfIn PDF document text
- https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd67aec49d---53274991989.pdfIn PDF document text
- http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2bd542bf---46666766625.pdfIn PDF document text
- http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706deeacba4---97895336634.pdfIn PDF document text
- https://bdaudit.ro/userfiles/file/nukirisoruxobabudel.pdfIn PDF document text
- https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/28e5ff6df89736a5df4dcd1025b5f5a2/naliz.pdfIn PDF document text
- https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2cb78841525bd2c0c93fbddeb1d94c75/37164814779.pdfIn PDF document text
- https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0acb1afa48---niwerumovif.pdfIn PDF document text
- http://shqinze.net/admin/upimg/file///24023758063.pdfIn PDF document text
- https://0900107678.com/upload/file/lurabinifakomivigato.pdfIn PDF document text
- http://vizcsap.hu/files/file/xobimesonomasas.pdfIn PDF document text
- http://topcudental.com/img/userfiles/files/kogunugobupivivod.pdfIn PDF document text
- https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/af2d0a7501ed2e9c709f3321f21b932a/20676516632.pdfIn PDF document text
- http://novelinternationalschool.com/ckfinder/userfiles/files/47067752121.pdfIn PDF document text
- https://troypin.com/calisma2/files/uploads/96906196000.pdfIn PDF document text
- http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f412637fe4---subasisotosorurojilisap.pdfIn PDF document text
- http://ibtaker.ps/userfiles/file/wokotobotip.pdfIn PDF document text
- http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cc495a631---sukikeri.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607727d532541---miwebudizifosaripoveriwes.pdfIn PDF document text
- http://rollfactorytogo.com/uploads/files/23824902808.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_off0000d306.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD306	10880 bytes
SHA-256: `11dff05f0ceca38400b4ca97447e6edb97879d654a8b3026a6dea2ef522f3abc`
`font_01_sfnt_off0000ebfc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBFC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001040e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1040E	18588 bytes
SHA-256: `38f53b89536f86c16521e0c1e297d2e439e65bcff9030514323971111b974918`

Open this report in the interactive analyzer, or submit your own file for analysis.