PDF malware analysis — malicious · 6b19a6b31bf9fe2e

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 22:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 2d0ac620bbdfa529594edbb6b4358589 SHA-1: 77a43462c245bd65b81e24595ead9eeb4596389e SHA-256: 6b19a6b31bf9fe2efb8407b51f31fa5c9d6943d8c8754d42e7407708002990e3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=basic+spherical+trigonometry+pdf PDF link annotation
- https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/hh5c3seb87ak39rpbjkpkis4l9/63389386915.pdfIn PDF document text
- http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1a9f4e88c---64432181286.pdfIn PDF document text
- https://inifd.london/uploads/file/zudidivimupefewolaw.pdfIn PDF document text
- http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080aa6c2d555---zatakuvodubobok.pdfIn PDF document text
- http://dongzzang.com/userfiles/file///matodimibufigadudib.pdfIn PDF document text
- https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/b50a98ca38dc866fad2edd8d9a134020/gikisavike.pdfIn PDF document text
- http://mikailang.net/userfiles/file/20210701223552_96109130.pdfIn PDF document text
- https://inijariku.com/ckfinder/userfiles/files/70457136782.pdfIn PDF document text
- http://liily.jp/upload/file/20210813000049.pdfIn PDF document text
- http://montaze.org/democms/userfiles/file/89915452953.pdfIn PDF document text
- http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161190a099f1c0---91838386521.pdfIn PDF document text
- https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/9b83dd37d2b6b9062ba0289a4e965927/xaxub.pdfIn PDF document text
- https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8f8ac296a0016bb5ff8825e23026836e/28718619193.pdfIn PDF document text
- http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b38d97b76---xumeporerujawobop.pdfIn PDF document text
- http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607298681cceb---12390774867.pdfIn PDF document text
- https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818c90ca0fe---56427463121.pdfIn PDF document text
- https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609829fcc3654---lumuvare.pdfIn PDF document text
- https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/dvq5e36vma59htk6pmq4peqdg2/13636102994.pdfIn PDF document text
- http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/dizimujogibazol.pdfIn PDF document text
- http://arcenevents.nl/site/upload/files/kobapuvagetiken.pdfIn PDF document text
- http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/57fdf7babc4ab456098712ad806dba48/13489317300.pdfIn PDF document text
- https://ropaalmayoreo.com/images/userfiles/file/30552556724.pdfIn PDF document text
- http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c09ba5eda4---60601676504.pdfIn PDF document text
- http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e5cdc3de6---xidevaguxajate.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_off0000d9e5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9E5	11236 bytes
SHA-256: `4e7ad5f1ae4957c385f06c4ca30472c3c30c495b1a691dd0864c9fd70433463a`
`font_01_sfnt_off0000f3e3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3E3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010bf5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BF5	17216 bytes
SHA-256: `277bac577a940f5c186a319339e6f30e96e5c12f143cc7bc5c6ccebe42ee4761`

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