PDF malware analysis — malicious · b2788c848d894921

MALICIOUS

PDF

68.3 KB Created: 2021-09-07 09:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 59b2c4cbab246af61eaba51035b24f85 SHA-1: c4c9e33b48a508002416b743bf8be55ae30cf93a SHA-256: b2788c848d894921d32d2edf6f2c6ba6a789a918be68edc9d57a8575a18f0abd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking any user-readable content that would suggest a legitimate purpose.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

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://stonepigments.com/userfiles/file/71008204777.pdf In PDF document text
- http://short-story.ru/upload/file/puwafisifabit.pdfIn PDF document text
- https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098529a4158a---35046236248.pdfIn PDF document text
- http://tochuchoinghi.org/files/nisapomipigega.pdfIn PDF document text
- https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/72421893193.pdfIn PDF document text
- https://matrainagycsalados.hu/userfiles/file/tafiletize.pdfIn PDF document text
- http://arunimaflavours.com/userfiles/file/xogezedoxutirofunubu.pdfIn PDF document text
- http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ebf0c8a9f---vuzegeramobod.pdfIn PDF document text
- http://trans-serwis.com/userfiles/file/39764426901.pdfIn PDF document text
- http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608305c0c96a2---mexusota.pdfIn PDF document text
- https://dcimx.com/files/73996086487.pdfIn PDF document text
- http://kaizenlife.com/ckfinder/userfiles/files/fovafanifuroviluduwikipu.pdfIn PDF document text
- http://stin-verdon.fr/assets/Image/files/xemomerepukowapawuw.pdfIn PDF document text
- https://jackyrouxmethode.com/userfiles/file/10884245622.pdfIn PDF document text
- https://angkortaxiservice.com/userfiles/file/9515470319.pdfIn PDF document text
- https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4e6104c1c5038f64ad936a286fa35f25/72437165430.pdfIn PDF document text
- https://medius.sk/userfiles/file/pifajabemowuwenubawuvil.pdfIn PDF document text
- http://kinel-hunter.ru/upfiles/file/marumep.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=phrases+and+clauses+worksheet+grade+6PDF 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_off0000ad1a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAD1A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000c52c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC52C	14872 bytes
SHA-256: `e2089cfcb4ad766299c504ed161bd6e7f4fb20184bfe090f3a245ec3813ceda6`
`font_02_sfnt_off0000ea83.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA83	11004 bytes
SHA-256: `dd1ac5abaaf2d534d43da575bed3615b118219179418472caee988d477b40520`

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