PDF malware analysis — malicious · a5555b18f932e136

MALICIOUS

PDF

97.5 KB Created: 2021-06-30 03:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 8da7b8163d31bdb87257af97e6b022c0 SHA-1: a8f343d064f00ef407cbd7a6c79f0a41b73feb9d SHA-256: a5555b18f932e136dbbdb4686abcd56b1fff4703c00d8a312133d57acd05c023

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of these links and the overall structure strongly indicate an attempt to lure users to external, potentially harmful, websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9936

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://ketchas.ru/uplcv?utm_term=how+old+is+rapper+drake PDF link annotation
- https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/160439765dc294093cf46ca525340636/10047694240.pdfIn PDF document text
- http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6f4e5bf59---5871311165.pdfIn PDF document text
- https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701e1762633---32133650127.pdfIn PDF document text
- https://twr1115.net/files/fckeditor/file/58640334543.pdfIn PDF document text
- https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/dc11318eb94452f2323f9a7dca54e3eb/14931996557.pdfIn PDF document text
- http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160900d7a8312f---towejufuz.pdfIn PDF document text
- https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/lfl6iakktinhqsaq2pdib748rm/11587329147.pdfIn PDF document text
- http://okulsanmalatya.com/imgup/file/mipujegili.pdfIn PDF document text
- https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/f86a1d2fc96a9c0811f7f77d769abec0/9046152716.pdfIn PDF document text
- https://123natura.com/stockages/files/21488701337.pdfIn PDF document text
- http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/623299d62f1f15c28be7a5db529e0e4c/80670103706.pdfIn PDF document text
- http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/65397b66d801eaaa380d2067c0865947/kotizuvur.pdfIn PDF document text
- https://clifestyle.net/uploades/userfiles/file/37150230422.pdfIn PDF document text
- http://curry-box-deluxe.de/userfiles/file/zosebetizililesu.pdfIn PDF document text
- https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/9s2rfprv95of963aae0o4qglf7/47900158773.pdfIn PDF document text
- http://commune-bourre.com/userfiles/file/vigowated.pdfIn PDF document text
- http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/tukegoxeluradutawa.pdfIn PDF document text
- https://accesoriosalmayor.com/images/userfiles/file/zekisotowasekijaku.pdfIn PDF document text
- https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/a11a0da3c0703697dfdd3499b7017ff2/83834646692.pdfIn PDF document text
- http://asja-doll.ru/userfiles/file/30097896318.pdfIn PDF document text
- https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/vcudkfo1js3u862l9ap4qtkrs7/79009482803.pdfIn PDF document text
- https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/ioedrbv96b8esbg9i0q93bp0v2/92310079721.pdfIn PDF document text
- http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aff5a51b71---48088721074.pdfIn PDF document text
- http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160721ef10eb41---80522191248.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_off00011b28.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B28	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001333a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1333A	17564 bytes
SHA-256: `303ca5c57eda9269af7e629a2d65a7307555727bcf7e3575f84dc325c4e3b402`
`font_02_sfnt_off00016117.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16117	10352 bytes
SHA-256: `033956d930822cea1a5a0f1400f17cc44358986573e4ca4e05db802948b719ab`

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