PDF malware analysis — malicious · f8cc5f5ffbf7270d

MALICIOUS

PDF

77.0 KB Created: 2021-09-03 07:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: b573470068d85d2079c6b65d7c8cce0f SHA-1: 79e15917f9657348ca15de28efd12bc853d12dfa SHA-256: f8cc5f5ffbf7270d3286d0439e56968f23ee4fbf64a72400d938fbaadfa31b9e

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. The file contains numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9943

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://allytemp.ru/uplcv?utm_term=presentacion+en+ingles+para+ni%C3%B1os+pdf PDF link annotation
- http://bjxbw.cn/userfiles/file/riwifosizejujixoba.pdfIn PDF document text
- http://skncn.com/u/files/melijuwigovutiluxeb.pdfIn PDF document text
- http://yangs-ns.com/ckfinder/userfiles/files/20210808011022.pdfIn PDF document text
- https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/1n9pc5np2552uuovebrdvogdji/revojulivox.pdfIn PDF document text
- https://mauspro.net/upload/files/49654956140.pdfIn PDF document text
- https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/igm63ic5qcbkse7e58abq6fld2/jazuk.pdfIn PDF document text
- https://mercerapparelss.com/userfiles/files/4012994173.pdfIn PDF document text
- https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdd1d9996d---tafijofikozirafifutezedog.pdfIn PDF document text
- http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2a8e1d056---38219835284.pdfIn PDF document text
- https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847748bfe9b---lanalamuf.pdfIn PDF document text
- https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16076c3a3ab2cc---kanefiwesunitamawulivuf.pdfIn PDF document text
- https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c05adbf48---84832977364.pdfIn PDF document text
- https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/k9dg5p4gdnkhlkgnk2lfb9a4nj/xatovaxizitunivuvag.pdfIn PDF document text
- https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/95d75553712558e678d7ad67f450e1a2/63395343809.pdfIn PDF document text
- https://relans-nn.ru/images/docs/file/15989971292.pdfIn PDF document text
- http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ael27ksg47t2s9l5c5qupcrqlp/38560811164.pdfIn PDF document text
- http://lingeriedediva.com/UploadFile/file/2021090102070173499.pdfIn PDF document text
- https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/939e8314d5e0a797a08fa2a9e764689a/42134911969.pdfIn PDF document text
- https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3968ddddfc---gabojiwajoxubaredunepuror.pdfIn PDF document text
- https://chasehr.in/userfiles/file/muxeko.pdfIn PDF document text
- http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/93ea7dc1139768022842c27c96d29db2/94852902617.pdfIn PDF document text
- https://kuepancong.com/contents/files/21536438794.pdfIn PDF document text
- http://humanlitech.com/files/files/13912109268.pdfIn PDF document text
- http://anhuicrew.com/upload_fck/file/2021-5-10/20210510075908247808.pdfIn PDF document text
- https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/bfd23fc42045dd305ea9b3ff813a8522/kijizoditokejujeges.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_off0000c281.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC281	11004 bytes
SHA-256: `c75b84471022097d672724478768f6605fc6ec410f684edcef3f04cac6d990be`
`font_01_sfnt_off0000dbbf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBBF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f3d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3D1	19272 bytes
SHA-256: `89368cb14a1ee120ad1885c487839ef318fe8ed1d6c7f9656c91158920d4afac`

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