PDF malware analysis — malicious · 9d435ba4219b3e5e

MALICIOUS

PDF

88.2 KB Created: 2021-07-29 19:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 37a5b282395ff29c110261be401c43f2 SHA-1: a5e284d050eae370e17d0144d750679f4531032b SHA-256: 9d435ba4219b3e5e7347fa4219905aebd83282a0bf461cd94bd5a4c2ee3754f8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://synerhu.ru/uplcv?utm_term=how+to+consume+forever+living+aloe+vera+gel PDF link annotation
- http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d5e9cbb81---97664734074.pdfIn PDF document text
- https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/r10o132s67tv6eqdimhot5do52/52772349378.pdfIn PDF document text
- https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/18d066a92f76e818d4d6ce41a342639f/87618363468.pdfIn PDF document text
- http://banhangcongnghe.com/upload/FCK/file/vovuf.pdfIn PDF document text
- https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c13bf4c02d87608d8b441c1af016bc46/fataforefi.pdfIn PDF document text
- https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/40d4deeca9e363f77666a888f6d85571/sobizudomotowasidapuxol.pdfIn PDF document text
- https://n-zvuk.ru/upload/file/15778897474.pdfIn PDF document text
- https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/610bdd93ddd36d983b2a11592ccc16f7/rimofixorugofonejo.pdfIn PDF document text
- https://steklo-shik.ru/userfiles/file/mijopojefage.pdfIn PDF document text
- http://fluitec.fr/ressource/site-image/files/bukozagakarisalosez.pdfIn PDF document text
- https://triosms.com/userfiles/file/27141111473.pdfIn PDF document text
- https://cottonweb.net/userfiles/file/dekugopolibajewele.pdfIn PDF document text
- https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa31b9936e3---mukodapudewidalu.pdfIn PDF document text
- http://yummyschool.com/_UploadFile/Images/file/52466574831.pdfIn PDF document text
- http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1139187964609ed77f55d4b.pdfIn PDF document text
- http://thrifty-uy.com/files/others/49231375220.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7a432f851---malazovawijesudeg.pdfIn PDF document text
- https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/01a6c2a06eb6c663ab05c4450832d30d/zarofipewof.pdfIn PDF document text
- https://bibliothequeanglaise.org/upload/files/56237281058.pdfIn PDF document text
- http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082efa62403d---22258860906.pdfIn PDF document text
- https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/a7de6beedfd7f6e39f18a4e93900cf1a/97826067727.pdfIn PDF document text
- http://china-zzld.com/uploadfile/file///2021062503350235.pdfIn PDF document text
- https://artlabjo.com/userfiles/file/xabup.pdfIn PDF document text
- https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac8ac4dd59---74117664763.pdfIn PDF document text
- https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/8c1c12ee914ac111b49d09724b6ec681/nikexabubebaxekorogopet.pdfIn PDF document text
- https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/19akhiq7fh97e235v8l6mcbglh/tatinevimi.pdfIn PDF document text
- https://securitydm.rs/slicice/file/kawegabilemodegajewopuvov.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_off0000f6fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6FE	16384 bytes
SHA-256: `e996ae4799ab50d544039a3c682f52811f167c2b5a0835f10a74b164cc053dec`
`font_01_sfnt_off0001215a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1215A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013971.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13971	10920 bytes
SHA-256: `d0631962efbd3441296d68a945b9fd94ebf63d0852fdc58163059bf5e910e2db`

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