PDF malware analysis — malicious · 163a0e31ad1bd2b0

MALICIOUS

PDF

89.4 KB Created: 2021-07-17 03:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 5a93826532dd370872af28f3a51d3b53 SHA-1: 1bc451937649fcab9b7d9de873806f205928e589 SHA-256: 163a0e31ad1bd2b041f2af05dcf0f9363d36612be19aaa854ef7ef5ad11b37d5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, characteristic of link farms used for phishing or SEO abuse. The PDF structure itself appears to be a link farm, designed to redirect users to external, potentially malicious, content.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/ec44028f53396fbd29509f839323b249/vesupevo.pdf In PDF document text
- http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/89468dklpq72dm7r1rnfrtvfm0/29794105458.pdfIn PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ad9b33475---33562447267.pdfIn PDF document text
- http://novosib-sport.ru/ckfinder/userfiles/files/55978313430.pdfIn PDF document text
- http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a874f7ecada---kavemasafixeloxasama.pdfIn PDF document text
- https://electrabicycles.pl/app/webroot/uploads/file/16232363410065.pdfIn PDF document text
- http://bycongroup.com/UserFiles/file/radakupaxe.pdfIn PDF document text
- http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fa6a76925---nezunibogowesomegow.pdfIn PDF document text
- https://aplusadvance.com/naver_editor/data/file/1001945704.pdfIn PDF document text
- https://diarch.in/WYSIWYGImage/file/zijiwoxefuluxaxiwatelosa.pdfIn PDF document text
- http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d21debbedc7---71699988498.pdfIn PDF document text
- http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe6035203c---gomiberusit.pdfIn PDF document text
- http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47c3fb91a8---88344097947.pdfIn PDF document text
- http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16082497c27e36---68278128193.pdfIn PDF document text
- https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/f7d3c2biqe6s0kurqrrrbnmf4r/rekokagesevufore.pdfIn PDF document text
- http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2a185877a---29419685928.pdfIn PDF document text
- https://actor-conseil.com/files/file/85604933396.pdfIn PDF document text
- http://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/10238621885.pdfIn PDF document text
- http://chroscina.com/userfiles/file/wudofuwolifetodozewarejad.pdfIn PDF document text
- http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609edd53dcdfb---9235535258.pdfIn PDF document text
- https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078a08611a29---47107101418.pdfIn PDF document text
- http://ncabhsa.com/clients/875427/File/pixujafaser.pdfIn PDF document text
- https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/4ea0a6c7076e18e57e621e09cc564f26/45438519271.pdfIn PDF document text
- http://www.ecvbrass.ch/user/web/file/86230575690.pdfIn PDF document text
- https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/428db5e56aa3db477b870d9367b507c3/gotatazunezaforelodoki.pdfIn PDF document text
- https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/04d8c497ec8e23317f8302c9dfa9c2d4/59085557120.pdfIn PDF document text
- http://kxzyjy.com/CKEdit/upload/files/sajalugegemodifaj.pdfIn PDF document text
- https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/2cb5e99a66afd913fe1889540a04566a/vijuvo.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=what+are+some+examples+of+mechanical+weatheringPDF 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_off0000f730.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF730	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010f47.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F47	11108 bytes
SHA-256: `3d47f416de501363fe80c6c4cbec86f78f189f1f777066ee140209804f6ef8ce`
`font_02_sfnt_off0001291a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1291A	17084 bytes
SHA-256: `c0cbbb1f333680ffee5121b4c67090fbf11384e4d892ceefc718c557a8c22d55`

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