PDF malware analysis — malicious · afe21dc6bcefb309

MALICIOUS

PDF

78.7 KB Created: 2021-09-01 12:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: f0dd6757148c3f9642a3165cc4cd5041 SHA-1: 2f46bea9f1fb495e53548e924a1083d008f552b2 SHA-256: afe21dc6bcefb3098b434271607e919499c64f720353d0562bfc523d71fc190c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, which flagged it as Pdf.Phishing.Trojan. The file contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of multiple external URIs and link farm heuristics indicates a phishing or malware distribution vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9941

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://atolab.it/wp-content/plugins/super-forms/uploads/php/files/665bfbf24a47c059eee819872180dc01/wujusivo.pdf In PDF document text
- https://astdubai.co/userfiles/files/86265524574.pdfIn PDF document text
- https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/kapce3v9qp37l209mc80sm6kam/95320444597.pdfIn PDF document text
- https://bya-ingenieria.com/ckfinder/userfiles/files/raxodu.pdfIn PDF document text
- https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/3pd87q2kpl4ffmu0a7e8piusp1/vapitugizukapu.pdfIn PDF document text
- https://areicon.com/images/file/57579454923.pdfIn PDF document text
- http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5f0c61474---33821852539.pdfIn PDF document text
- https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4bb7eb2e---xixavosutarolin.pdfIn PDF document text
- http://windmill-bv.com/userfiles/files/wisumurujo.pdfIn PDF document text
- http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161137f5313d8d---joruranekulo.pdfIn PDF document text
- http://tachikawa-derma.biz/ckfinder/userfiles/files/68191659329.pdfIn PDF document text
- https://habibitours.org/ckfinder/userfiles/files/84988591055.pdfIn PDF document text
- https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/5a70f67053d7f1bb1be8766ffd72cf7e/96421852285.pdfIn PDF document text
- http://zonazero.es/userfiles/file/75457092259.pdfIn PDF document text
- https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/mp10d00djlm7kpb589ql1mjs8a/24178679199.pdfIn PDF document text
- http://abimobiliare.pl/pliki/File/57930300304.pdfIn PDF document text
- http://arunimaflavours.com/userfiles/file/labagemazikukule.pdfIn PDF document text
- https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/94e36ebee228f4ba832adf8cf11f00e5/86241411559.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36e0c6ee6---lanuwopexibidafi.pdfIn PDF document text
- http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/04a1b93e52de4e1536d3cfe69acc6edb/mexenugijomizuxa.pdfIn PDF document text
- http://xnkvinatimex.com/uploads/files/mavuwupovogikafixad.pdfIn PDF document text
- https://securitydm.com/slicice/file/1201517834.pdfIn PDF document text
- https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/uqolhsnv1mtqbp2tegnkchsqcv/14288785138.pdfIn PDF document text
- https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/1e502a6ebaa388a7336432ef7a035840/4381942531.pdfIn PDF document text
- http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611a3046482e1---8005610380.pdfIn PDF document text
- https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3e52d5535---rovelebajunabidadurene.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=download+thomas+calculus+11th+edition+solution+manual+pdfPDF 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_off0000cd29.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD29	17236 bytes
SHA-256: `7312109722e25ca33d05cea8240ecbe5f7b99479704e1faf90492cedf53c9122`
`font_01_sfnt_off0000f9b8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9B8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000111cf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111CF	11024 bytes
SHA-256: `41eb97e90337c6f1fba08b88fcc4490630cd253a97fafba1582da4034873cf1f`

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