PDF malware analysis — malicious · e5629aec3ccab815

MALICIOUS

PDF

85.2 KB Created: 2021-07-03 06:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: bb9c60c987a4687c9c0787e34b376663 SHA-1: c1cda070bcc02294c3689c64ee7f1afe8e4cdd63 SHA-256: e5629aec3ccab815ad790de630a3c1175c04a0fef46f286190db3bd6525e00ed

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a tactic to host malicious files or redirect users to phishing sites. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://hondamienbac.vn/userfiles/file/454978237.pdf In PDF document text
- http://infinity-pro.ru/userfiles/file/56122449187.pdfIn PDF document text
- http://www.zywawiara.pl/pliki/baluziwolawavakekokatim.pdfIn PDF document text
- http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/zaponevibaxapizu.pdfIn PDF document text
- https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/9660db120aca6142a83438ee57b25ac4/setosovixod.pdfIn PDF document text
- http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec66645dd4---pakepe.pdfIn PDF document text
- https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e81fc4fe5a---dotogamivozimu.pdfIn PDF document text
- https://digireg.se/upload/83173276045.pdfIn PDF document text
- http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca92d70e83---32947963208.pdfIn PDF document text
- https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607982153d0ec---simepifotifusixiwisevaz.pdfIn PDF document text
- http://bamila.vn/luutru/files/mezumuwujumavolelugipum.pdfIn PDF document text
- https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/80c9a7fe71939eead636411764dc30c5/xupabedagimoxenifiwuzu.pdfIn PDF document text
- https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/340bj2l1uk9ii746qgaivfl8q6/1278725324.pdfIn PDF document text
- https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/048ffcf37a9cb05a807e6200e889c9b1/19263681866.pdfIn PDF document text
- http://bluecars.pl/userfiles/file/xenepimup.pdfIn PDF document text
- http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ruwanogite.pdfIn PDF document text
- http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bad870594be---puxafenu.pdfIn PDF document text
- http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608137309648e---68909401520.pdfIn PDF document text
- https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/9e4d851960c01d5137e850fc08df3eb2/xopesuwefu.pdfIn PDF document text
- https://togeltop.net/contents//files/95063918940.pdfIn PDF document text
- https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/58e148a260cf05a34a70cca0e418dab5/rabepenutifuwi.pdfIn PDF document text
- https://termoformat.md/img/files/66421612292.pdfIn PDF document text
- https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/r5ai2fvmf79csj8281cgecmrva/77539727202.pdfIn PDF document text
- http://uni-farm.pl/ckfinder/userfiles/files/71022279096.pdfIn PDF document text
- http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160821ba155b78---lagawoma.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cubital+tunnel+syndrome+claw+handPDF 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_off0000e912.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE912	11108 bytes
SHA-256: `aa104c5dfaee0bea4ceda9a48eb3a5fc1da94ca3965080e6635b15e0daf43c29`
`font_01_sfnt_off000102dd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102DD	16448 bytes
SHA-256: `a29167b07917437510c226be9722c5356f07fbf80d3f771c502a06a95af5401d`
`font_02_sfnt_off00012d91.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D91	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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