PDF malware analysis — malicious · 7a8c8c433fe261f4

MALICIOUS

PDF

85.9 KB Created: 2021-07-30 23:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 5e51ad2a2b923f364dd8b3f8b7370d4e SHA-1: 0764d10c5e449cf136df6cde7666497ff3022de8 SHA-256: 7a8c8c433fe261f4780597a0485a6c5360cd231969274a4c4f9f910923c3feaa

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, pointing to numerous compromised CMS upload directories and disposable hosting sites. The presence of external URIs and the overall structure suggest an attempt to redirect users to potentially malicious or phishing content, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/65b8cc8a9bbebea9543fe815de7032f3/73881285557.pdf In PDF document text
- http://thamdinhgiadaiquang.com/img/files/zubafovagonaganiseras.pdfIn PDF document text
- http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160790e10c6b24---xoxibipasimirobola.pdfIn PDF document text
- https://unique.global/wp-content/plugins/super-forms/uploads/php/files/ffbccf8bae4d3bb25ed965cf031e193d/lasutufisiwunikawan.pdfIn PDF document text
- https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/6ngao7upn9tnacjb79qbkrosn2/wabixuta.pdfIn PDF document text
- http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/gigobefapojasa.pdfIn PDF document text
- https://bestcoloringpages.com/userfiles/file/dovumatogu.pdfIn PDF document text
- http://candybeauty.vn/upload/files/91481435743.pdfIn PDF document text
- https://cplastik.com/data/cms/file/87010742683.pdfIn PDF document text
- https://alteanetworks.fr/img/file/kegamo.pdfIn PDF document text
- http://doo-san.com/userfiles/file/20210513022427.pdfIn PDF document text
- http://www.hussco-steel.com/husscofiles/files/temaza.pdfIn PDF document text
- https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2b7d8c82b624ec806b03f1b325705edc/41803776193.pdfIn PDF document text
- https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e17ecf564---42773823112.pdfIn PDF document text
- http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/n8hq417a7u1cqjilpvjopbgcj5/xavuzefovatelojawuz.pdfIn PDF document text
- http://dalnoboy.net/data/filestorage/upload/files/gowarubagoxuwepugokafe.pdfIn PDF document text
- https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac611747b---nubezitexuzujadu.pdfIn PDF document text
- http://maremio.ru/admin/ckfinder/userfiles/files/9055882199.pdfIn PDF document text
- https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc113f29db---jirewivukonulofoxi.pdfIn PDF document text
- http://www.adarshvidhyasankul.org/userfilesfile/zumoxedijarizum.pdfIn PDF document text
- http://deeringbayrealestate.com/userfiles/files/17007231742.pdfIn PDF document text
- http://samafb.org/uploadfilefiles/32611381870.pdfIn PDF document text
- https://jamuiboe.com/webroot/upload_media/xaxosuxaviwejo.pdfIn PDF document text
- https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/ad1fb93f47d7c936bff37752b4f547ca/95742487931.pdfIn PDF document text
- https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/27bdaf7307381e59ec7de5556bbfd95c/67875948995.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=xbox+360+jtag+rgh+tutorialPDF 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_off0000ec44.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC44	10924 bytes
SHA-256: `bc4a5f7101744b3af1ea0cad6dbed95eac351153180b1f717d1988ca995e66a0`
`font_01_sfnt_off000105aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105AA	17348 bytes
SHA-256: `de0ba20208600fe7a054eeb73b433c4eda13b2be763013edcd88f540485b8638`
`font_02_sfnt_off0001325e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1325E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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