PDF malware analysis — malicious · e533acfc78a9d670

MALICIOUS

PDF

87.7 KB Created: 2021-07-13 01:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: d32624ba806d34e01804d3f5c9bcd505 SHA-1: 14bb5a850ac2aed7ffce6ffa1b0b0db0ec973d99 SHA-256: e533acfc78a9d670ca44aab7df8721aab2299060b497d1505f36496fbeda5a2d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, pointing to compromised WordPress sites and other disposable hosting. The primary URL, https://coretry.ru/uplcv, suggests a phishing or malware distribution attempt, likely using the 'plastering and painting ppt' UTM term as a lure.

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://coretry.ru/uplcv?utm_term=plastering+and+painting+ppt PDF link annotation
- http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608102ae916e3---fizekijulimozuverejire.pdfIn PDF document text
- https://duext.com/wp-content/plugins/super-forms/uploads/php/files/cba904bbbfc5b33d63ce275039e9f2b6/piwekomamewipobebeginig.pdfIn PDF document text
- https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f435063ea---porefafovogetipumimubo.pdfIn PDF document text
- https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/7fcunkpp6kium656ucaubd4640/43005189800.pdfIn PDF document text
- https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700eaf413cf---35120490419.pdfIn PDF document text
- http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/90340577292.pdfIn PDF document text
- http://richardsonfamilyreunion.net/clients/7/79/79e100fddb184f5a3447a495e7c481fb/File/70761345050.pdfIn PDF document text
- http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d248153e02---wupapukibaf.pdfIn PDF document text
- http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/vizuniwegigidesilud.pdfIn PDF document text
- http://mlsy.cz/images/file/files/bowige.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083da2d49ae9---75017465114.pdfIn PDF document text
- http://netmutum.com/userfiles/file/15646195087.pdfIn PDF document text
- https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087186a0488a---23709991183.pdfIn PDF document text
- http://jnafarms.com/clients/864068/File/87721860314.pdfIn PDF document text
- https://geneolock.com/ckfinder/userfiles/files/68676689461.pdfIn PDF document text
- https://orig-shop-gsm.ro/ckfinder/userfiles/files/31289105644.pdfIn PDF document text
- http://bularz-auto.pl/images/userfiles/file/bekawazibeberulawoz.pdfIn PDF document text
- http://aqbnb.com/uploadfile/file/5387232012.pdfIn PDF document text
- https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d42e79ec7d---94497740181.pdfIn PDF document text
- http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/48993291635.pdfIn PDF document text
- https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/cpsepfplgt8q7cfhli2q5gt13r/29622684538.pdfIn PDF document text
- http://sosnovgeo.ru/userfiles/file/44220154031.pdfIn PDF document text
- https://bluetact.com/locktactyuma/userfiles/file/68076442848.pdfIn PDF document text
- http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a302c582e8---roredegoseluv.pdfIn PDF document text
- http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/2bcdc01884076adbdef5636895df1785/87084317681.pdfIn PDF document text
- http://biolabsrl.org/userfiles/files/vunonu.pdfIn PDF document text
- http://leakefamilyreunion.com/clients/63964/File/13456375546.pdfIn PDF document text
- http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/52442968038.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_off0000f5f1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5F1	16820 bytes
SHA-256: `007e04a268fa0929f5e83344d9fb0bdfba78f861d1fea9c6029b53093fc23dc7`
`font_01_sfnt_off000121b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121B6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000139cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x139CD	10448 bytes
SHA-256: `0862e3de8cbfb5e74f4f223a96a98222c8b33e5d71698d910b99b93c254aa6d5`

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