PDF malware analysis — malicious · fe2271170b87ef37

MALICIOUS

PDF

90.9 KB Created: 2021-08-25 22:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 0816c51b6cfc6e8b625c2cc4de54f35c SHA-1: b18583940b3c1436f08cd00aed9ded60418bf494 SHA-256: fe2271170b87ef37c13de6d7f4fac14b61a1d9df6922ff40a7463a4ea467fed8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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://universalthailand.com/images/uploads/ckfinder/files/35877855275.pdf In PDF document text
- http://bigxra.com/uploadfile/file/2021051614434073499.pdfIn PDF document text
- http://kp-technik.cz/ckfinder/userfiles/files/62346738711.pdfIn PDF document text
- https://conexkarvan.com/cache/fck_files/file/86621680586.pdfIn PDF document text
- http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee11695dda7---1641906566.pdfIn PDF document text
- http://gmicropilotes.com/uploads/files/nexulib.pdfIn PDF document text
- http://poorclarescork.ie/images/bulinafu.pdfIn PDF document text
- http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/51562926098.pdfIn PDF document text
- https://corianderedmonton.com/ckfinder/userfiles/files/wovazugerujebelomirosaxa.pdfIn PDF document text
- http://vincentpopetutoring.com/clients/d/dd/dd6b7bcf94cac99d3bed97cf8166637b/File/10083016204.pdfIn PDF document text
- http://urbanconstructions.org/images/uploadedimages/file/76504856268.pdfIn PDF document text
- http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/e0af95fe8aeb29b9391eb1abe89e6c4e/kefutufape.pdfIn PDF document text
- https://medpressa.ru/files/file/velilofopofamiwe.pdfIn PDF document text
- http://nuovojob.com/userfiles/files/74497785183.pdfIn PDF document text
- http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e39b856c24---53534226673.pdfIn PDF document text
- http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870eafec6ac---basofifabomedobega.pdfIn PDF document text
- https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086205b05073---67684734132.pdfIn PDF document text
- https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a494af92919---dujimomojexenipadokutit.pdfIn PDF document text
- http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/421511851.pdfIn PDF document text
- http://yossy.biz/userfiles/file/lifikalusukivolozu.pdfIn PDF document text
- http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/diganajoxojatafutuf.pdfIn PDF document text
- http://bulk-supplies.com/userfiles/file/bimow.pdfIn PDF document text
- http://www.aamuhsv-madisonalumni.org/files/files/74464782316.pdfIn PDF document text
- http://healthywithhart.com/res/file/71254200921.pdfIn PDF document text
- https://seeyounow.net/userfiles/file/49843383165.pdfIn PDF document text
- https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/4ku6i1bgial5j1m9ataja177j2/popapozonepepigik.pdfIn PDF document text
- https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/j1h64g3caauh5s2prcem60f20g/49664604956.pdfIn PDF document text
- https://mzr-avocats.com/buddha/ckfinder/userfiles/files/teviz.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=kidney+infection+blood+in+urinePDF 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_off00010213.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10213	17008 bytes
SHA-256: `4624c0fc7508c76c8208310aa8c675b44ebe4e88ded8c6044ca52e33bef45d60`
`font_01_sfnt_off00012dc2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12DC2	10484 bytes
SHA-256: `596ab960c71629c40e5ebe5b6ce72920b31628f195acf1350fbb6f7e33a6e145`
`font_02_sfnt_off000145ae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x145AE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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