PDF malware analysis — malicious · 210f2a6c65b6f2bb

MALICIOUS

PDF

95.9 KB Created: 2021-06-29 09:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: efd6aaca742205c9360de28206d10008 SHA-1: 908de206e48d903b34a9abaf31102f6373005b73 SHA-256: 210f2a6c65b6f2bb35ae0a83c70fcc0e9f51e6a2be17d0feeadb80cfd557c90d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm hosted on multiple compromised WordPress sites, a common technique for distributing malicious content or conducting phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on disposable hosting further supports a malicious campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9806

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 http://veterina-hrib.cz/user-uploads/files/nufolivajazoluvolobax.pdf In PDF document text
- http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085836b7c945---30454684899.pdfIn PDF document text
- https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/k96soqgk9ukkd3bemjq70f6amf/xopenusaxanoxelibaxebetaj.pdfIn PDF document text
- https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/nfhk0r580s0ag0i3na1p9vmvc0/vabitimitidup.pdfIn PDF document text
- https://musikkursus.dk/userfiles/file/fikogan.pdfIn PDF document text
- https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/d1m85bm157tgngg2aime95bsp0/golepasuwifoniv.pdfIn PDF document text
- http://mashtalkandil.com/userfiles/file/tudodogiva.pdfIn PDF document text
- http://creative-format.com/upload/editor/files/xiraxosotopugerejejed.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c99c26595---togabodusasu.pdfIn PDF document text
- http://opakowania-loga.pl/zdjecia/fotki/file/77306118850.pdfIn PDF document text
- https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bed222c79b---87463406954.pdfIn PDF document text
- https://unique-u.biz/images/uploads/file/8695629565.pdfIn PDF document text
- http://stromzeleny.cz/file/15435320913.pdfIn PDF document text
- http://stadion-zarya.ru/ckfinder/userfiles/files/doxijadomomodofusaz.pdfIn PDF document text
- http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eeb68d0ed---7632697419.pdfIn PDF document text
- https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/3085eaf116a0daeb87fed9bc4c7c6c1e/zitipanidaju.pdfIn PDF document text
- http://www.haztartasigepszakuzlet.hu/pics/file/dizipikorebujo.pdfIn PDF document text
- https://netiko.ge/img/Data/file/nimubojarudiwenuvotiwiz.pdfIn PDF document text
- https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/uk9plndrhhumo7d2lt5r8p82m2/pixufarudededonerej.pdfIn PDF document text
- http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9842136e6d---49606571090.pdfIn PDF document text
- https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/8cb98ad6e5999738e53ebc0609c6fe42/gebiwetilinomul.pdfIn PDF document text
- http://veronikavilla.hu/userfiles/file/wofebetilurakitekoxakefaz.pdfIn PDF document text
- http://mazurubezpieczenia.pl/zdjecia/fck/file/mefebujifanod.pdfIn PDF document text
- https://majorsagilekvaros.hu/uploads/file/12642241386.pdfIn PDF document text
- https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7d125d6b1---govuvol.pdfIn PDF document text
- https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/25a81bde4a71737bf207615e7bcf8469/nivojikalik.pdfIn PDF document text
- http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7a3bd476e---97027139598.pdfIn PDF document text
- https://santchavarabed.in/ckfinder/userfiles/files/bizakopavedaweremuguz.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=derivation+of+capacitance+of+spherical+capacitorPDF 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_off0001145f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1145F	10644 bytes
SHA-256: `ad93e7282d0e3a3e27bfaf295056cbe62847f2f1fa21156d3c7bbb6c923aa2fc`
`font_01_sfnt_off00012cb4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12CB4	17132 bytes
SHA-256: `332f4d20f1a4d18537836434509273405ed0c3ce3ecf82fb54f28868e076426d`
`font_02_sfnt_off0001597d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1597D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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