PDF malware analysis — malicious · 8b44b4a4fd6e43d3

MALICIOUS

PDF

79.4 KB Created: 2021-09-02 13:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 39124766a34f4981047dff58d4dc8b59 SHA-1: 2ca2fdf98ff3d35e8559f032eb43aed978d00418 SHA-256: 8b44b4a4fd6e43d3f583ff96b71918fe94d2263acc8478e20cb0b041769bf714

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many hosted on compromised CMS upload directories, suggesting a phishing or credential harvesting attempt. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/m6drf95ag1o4h0p91s8kn62bh7/zinosuzuzeferunine.pdf In PDF document text
- https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f539800018---45727404448.pdfIn PDF document text
- http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e57fcf48c3d---97557962268.pdfIn PDF document text
- https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/f2339741543a9b4730deb63c602b10cc/sadipalilomomovadeg.pdfIn PDF document text
- http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05a1adb62---2694726048.pdfIn PDF document text
- http://criminisiepartners.it/userfiles/files/2802835386.pdfIn PDF document text
- http://connect-senior.ch/uploades/userfiles/file/gelano.pdfIn PDF document text
- https://i-chat.tw/js/ckfinder/userfiles/files/20765304386.pdfIn PDF document text
- http://aotwresort.org/ckfinder/userfiles/files/57160798038.pdfIn PDF document text
- http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/3u2tr9junlqf8ms5apepdgtott/xiworafugigonevosoxajelu.pdfIn PDF document text
- https://tradingphrases.net/userfiles/files/28886797407.pdfIn PDF document text
- https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/923ee3847825746d71235dbe305afea6/15909612021.pdfIn PDF document text
- https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/57898a1b9bd970a711df128f7ee52b86/tisilakezojitesulebib.pdfIn PDF document text
- http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16092f876aa973---31761777170.pdfIn PDF document text
- https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/601035c5029bce01d3e6847149b0e11a/zagosodagosokaxikozirido.pdfIn PDF document text
- http://phuocthuan.vn/images/pic/file/tivesanemabagedow.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/kcqetat5a817v3j2o2u15ten77/4062060645.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7dbf14c59---59200174897.pdfIn PDF document text
- http://topstec.com/d/files/zejamuzosowerofuk.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cb7c2265ce---88917697620.pdfIn PDF document text
- https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c374497e39c---44532206558.pdfIn PDF document text
- http://tuanlongland.com/upload/files/vaxuvekifixazef.pdfIn PDF document text
- https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160960444cce3a---67239791676.pdfIn PDF document text
- http://ourpreferred.com/userfiles/files/84309365353.pdfIn PDF document text
- https://too.kg/wp-content/plugins/super-forms/uploads/php/files/92332767c3a1e14e5991f0e801dc2a39/vexijifojozibejezojixe.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+five+dysfunctions+of+a+team+pdf+freePDF 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_off0000d267.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD267	16900 bytes
SHA-256: `93c5ba42bde2c9d1ab0327cd2ed820549a361f19545aafe0fc329225c70d046e`
`font_01_sfnt_off0000fe20.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE20	11084 bytes
SHA-256: `874e89f1c04c035b4a67fed0314c35945de7d3d936148c935efbe76430533d71`
`font_02_sfnt_off000117da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117DA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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