PDF malware analysis — malicious · 4a2e182ae4a7ef0b

MALICIOUS

PDF

103.1 KB Created: 2021-06-27 19:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: a3d760a4a63bd9f37815af7cd41c31ca SHA-1: 55e35a852c4036f8aad344f7a508e02b562f870a SHA-256: 4a2e182ae4a7ef0bb423722f140157c1424616a14c99b0f96c0e445e740a6e9e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and link farms indicates a likely phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9874

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://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af2c8377d80---fovewunukarusivolefem.pdf In PDF document text
- http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb51b1a3a02---8132014509.pdfIn PDF document text
- https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/506612d8ec79ca8110f48933c26068e6/33831967317.pdfIn PDF document text
- http://iburgisidimarsala.eu/userfiles/files/sakotupunep.pdfIn PDF document text
- http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16083268160c2b---munalag.pdfIn PDF document text
- http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4770eac4e9---nakobopitaduberiloza.pdfIn PDF document text
- https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/33f25128ad4cdb492c640ad93a63b525/simowaxojasubadow.pdfIn PDF document text
- https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/gdur6fj6kl1qbhrfej6muuss1u/50732830559.pdfIn PDF document text
- https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/ut9cce6gra5vd4cbg2tderh9i4/baxififedozugina.pdfIn PDF document text
- http://voxel-avocats.fr/uploads/file/9040204725.pdfIn PDF document text
- https://metnar.pl/web/uploads/files/kunumopotifuvevos.pdfIn PDF document text
- http://simonide.org/userfiles/file/vodokufolutum.pdfIn PDF document text
- https://k-newsletter.com/ckupload/files/rodisukinip.pdfIn PDF document text
- https://aadhaarretail.com/administrator/imagetemp/file/puxuzi.pdfIn PDF document text
- http://broorybulldogs.com/clients/33993/File/lowunumobalisefamaba.pdfIn PDF document text
- https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/2rbia1hm2a4124upo6vbcqck95/tidet.pdfIn PDF document text
- http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/d88fda5539cce696ab1092d2fbead82e/33761464555.pdfIn PDF document text
- https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/2b2d3e526c0721676847e932bd5f5293/jebanuzadobeneponulenene.pdfIn PDF document text
- https://schmitz.cz/res/file/75200244989.pdfIn PDF document text
- http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/c8b1b01987e98b48a361c3e4c508f4f1/jipadi.pdfIn PDF document text
- https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/9a636528ac8358db4c2a69c7a67e6cad/xerinuzegazerowi.pdfIn PDF document text
- http://web68s.com/upload/files/mafalesibiwopawatawusolik.pdfIn PDF document text
- https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/bf43816e36a775acea62ff0312d30548/23764407041.pdfIn PDF document text
- https://kaptenhoki.net/contents//files/75592068306.pdfIn PDF document text
- http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdce1e97ec---60188484644.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=lowest+common+multiple+of+16+and+24PDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000115d0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x115D0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00012de7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12DE7	11244 bytes
SHA-256: `6355551b26b3171bc349c6b1999aedd88e69efee6e3341ca5f8eb3c84094737b`
`font_02_sfnt_off00014866.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14866	18228 bytes
SHA-256: `ac61577647a58b944b864878b0e08da1dd2bc66917972f86d15082a711807ce5`
`font_03_sfnt_off00017937.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17937	16084 bytes
SHA-256: `325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7`

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