PDF malware analysis — malicious · 31dd859e3612dd38

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 03:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: cc22b7c96e04783cad2c78304396b2fb SHA-1: 51a186090c3d7cc759774c1df127405c4aa4d8be SHA-256: 31dd859e3612dd3863da1e7b7f1dadc787771868b327298e3e2d373f4f972080

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm for SEO poisoning or phishing. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific content or intent beyond the link farm behavior.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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 http://prabashproperties.com/ckfinder/userfiles/files/5738349221.pdf In PDF document text
- https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/fbe8b2ad616b053a7bef68a4bb30aeff/16863372648.pdfIn PDF document text
- https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d758ce111---30663940586.pdfIn PDF document text
- https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd8a3e4a60---vofizo.pdfIn PDF document text
- https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/vnhd0lsic17eoidjn54us0nncb/1160663344.pdfIn PDF document text
- https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/c714d2b4e52b1dfe600e2804aed5ba60/sasololezamegurenexij.pdfIn PDF document text
- http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d992e4225c4---14601966976.pdfIn PDF document text
- https://madeirashopping.com/userfiles/file/48942859896.pdfIn PDF document text
- https://luminex.pl/upload/file/lafisafu.pdfIn PDF document text
- https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075a04713f8f---63919595777.pdfIn PDF document text
- http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4bc9ada94---6334992863.pdfIn PDF document text
- http://tabletopad.com/images/file/28368446793.pdfIn PDF document text
- https://www.gullyracing.it/admin/ckfinder/userfiles/files/kibuvomitunedopo.pdfIn PDF document text
- http://someteme.com/archivos/_20210713233517.pdfIn PDF document text
- https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/f62q84hskj6s5ojv0i91pcl7rh/6824963288.pdfIn PDF document text
- https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ac1ad214f---gazuputowiz.pdfIn PDF document text
- http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/12fahu7g73nlkeiejg8o8s37m2/sekekewikevujeferir.pdfIn PDF document text
- https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/s8i7h4dp3cdg7f2716qt0lk008/nomewafugofevibelujuzak.pdfIn PDF document text
- https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/16ff11e353eef3b1863a2ace4a7f3d50/90653158477.pdfIn PDF document text
- https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/51a9a885575936c226c44f4a4ee9f836/40064083169.pdfIn PDF document text
- http://gianphoiduyloimodel.com/Images_upload/files/21148408225.pdfIn PDF document text
- http://zgkimsteszew.pl/img/upload/files/fesirukaz.pdfIn PDF document text
- http://iwort.de/userfiles/file/12496144374.pdfIn PDF document text
- http://vin-baietii.ro/ckfinder/userfiles/files/89450004618.pdfIn PDF document text
- https://eravukappalpalli.com/userfiles/file/badimaxuwe.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mold+in+water+supply+pipesPDF 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_off0000e096.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE096	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f8ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8AD	10676 bytes
SHA-256: `42a5cc8c5cd2ed7f4af35debaa1bfdd80b25defe62d7ec7ce150a37ec3b01c9f`
`font_02_sfnt_off0001114c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1114C	16956 bytes
SHA-256: `f0064425f929c0c96153a4621b34db07b0baf4df4e0f30e9345fafd05958bf44`

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