PDF malware analysis — malicious · 4eb88135fe22051f

MALICIOUS

PDF

90.0 KB Created: 2021-06-29 06:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 4c604ae2963819a8869f9fb92137dae7 SHA-1: 2dbdbdfa0b6de3f06260c65f58a1bc50ee0c38e2 SHA-256: 4eb88135fe22051f11b87016455a9dad2b8eb6e5d2b3054386ab7e178f1f640b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics suggest.

Machine Learning

Nyx PDF Classifier malicious score 0.9765

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://bloomx.com/sites/all/sites/bloomx.com/files/diludorufipanawovewipasab.pdf In PDF document text
- http://madmojo.com/fckupload/file/34420199363.pdfIn PDF document text
- https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ff66600e3gui65paemgu2d2960/mujinesatoti.pdfIn PDF document text
- https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/34ec0d4eec5f76b0d53a43e2fe521cb2/nogexusimuvuzesa.pdfIn PDF document text
- https://unosms.us/userfiles/file/41443461169.pdfIn PDF document text
- https://braintreeclinics.com/app/webroot/img/files/64513955245.pdfIn PDF document text
- http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd0118ee6d---34984338036.pdfIn PDF document text
- https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/89e7ba192c6178599d17670bc6473b6d/bolabow.pdfIn PDF document text
- https://itacademyindia.com/ckfinder/userfiles/files/78368467257.pdfIn PDF document text
- http://delshadian.com/public/userfiles/file/vugepulanoridowiwevedetar.pdfIn PDF document text
- http://tencanpowder.com/d/files/52788321358.pdfIn PDF document text
- http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/89344884704.pdfIn PDF document text
- https://dacsanmyhuongbeti.com/app/webroot/files/images/pages/files/43941340298.pdfIn PDF document text
- http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078ed8513014---62102189627.pdfIn PDF document text
- https://lamthong-marchph.com/piceditor/file/28520361734.pdfIn PDF document text
- https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d49488663f---kawujab.pdfIn PDF document text
- https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/didogojode.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/iccm2docri2402nake0mnaq1r1/vajosogovoxutawaguwuget.pdfIn PDF document text
- https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/89744bef6d2a4d715d78029e6abb55a0/62837828103.pdfIn PDF document text
- http://fullcolorspandoeken.nl/userfiles/file/zulowu.pdfIn PDF document text
- http://asfalon.com/__files/file/56832719744.pdfIn PDF document text
- http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609020524ba8f---pelirosibixiboluzoku.pdfIn PDF document text
- http://szakkepzosiklos.hu/upload/file/26548571489.pdfIn PDF document text
- http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160aa343fa5076---silegegabaleme.pdfIn PDF document text
- https://prestinieurope.ch/userfiles/files/waluxovuwet.pdfIn PDF document text
- https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/fe0239a3eb18adeac7ca06ca22128631/gilosiguwixesomagefodup.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=you+make+me+wanna+one+more+nightPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e67f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE67F	3328 bytes
SHA-256: `81186e7b84e2a43daa4effb2fc01fb1d2c8ff1b46a94cf4fc9b5159f025ba713`
`font_01_sfnt_off0000f38b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF38B	26100 bytes
SHA-256: `dcf7492d0b1c30fc7ac1413cbcb3810a4241438428afd35fb39517a7ca5e9707`
`font_02_sfnt_off00012a7a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A7A	10604 bytes
SHA-256: `0887d6041c057c866980efe423f950f55e1178d7f6295bb7c464e195df6e77c0`
`font_03_sfnt_off0001428b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1428B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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