PDF malware analysis — malicious · f3b9c2d434f3f794

MALICIOUS

PDF

81.4 KB Created: 2021-07-20 19:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: 7238f1b21ac151b7c4866552d417476a SHA-1: 90f3949d35e9af59afcdc03f6ab708b1b2af0d90 SHA-256: f3b9c2d434f3f794699774dc543cece8d9001ea2cfe85c0d5022c031afc8d41c

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 high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. The embedded URLs, such as http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075900f3382f---33015904514.pdf, are likely used to distribute further malicious content or facilitate phishing attacks.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160746aedb92d3---83781539745.pdf In PDF document text
- https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/d5befd8e896336b31c0356c3bbb58830/gosipedisafogat.pdfIn PDF document text
- http://bjsprt.com/uploadfile/file///2021051607505860.pdfIn PDF document text
- https://bczenekar.hu/files/file/wasuxaliga.pdfIn PDF document text
- http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a208b4cae50---60499776553.pdfIn PDF document text
- https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781d6062391---jitilawolamotuluvis.pdfIn PDF document text
- https://majubesar.com/contents//files/55024127081.pdfIn PDF document text
- https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/dc72c6287d007a4fe628b7c5d1bc5f64/metezasaliloxinus.pdfIn PDF document text
- http://pileshoppen.dk/userfiles/file/6958877824.pdfIn PDF document text
- https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/hccukjgh5gr9su9nf2u6tj5rit/duxivazowiv.pdfIn PDF document text
- http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/16db3ec0f4e478ee0ca6fc87896559d3/86738967643.pdfIn PDF document text
- https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/c66a44b6e601ace729c9c2dae570e2fa/woturimotujonaxakideku.pdfIn PDF document text
- http://sahrugs.com/userfiles/file/96618848703.pdfIn PDF document text
- https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/53087682406.pdfIn PDF document text
- http://kasargod.net/uploads/file/40120486575.pdfIn PDF document text
- https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce6c678570---mavakuruporuwapebojudi.pdfIn PDF document text
- http://diennuocdanang.com/uploads/image/files/8337489685.pdfIn PDF document text
- https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/97mmdrq5rm17oav0logn92a4hf/37296453761.pdfIn PDF document text
- http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/sfnco38dd1k8fac8oimurog2t3/kitunakabowipa.pdfIn PDF document text
- http://www.anclupnapoli.it/userfiles/file/xufenilapazabavul.pdfIn PDF document text
- https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160904cb7705d0---karavununiren.pdfIn PDF document text
- https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16090d0860b212---94486219472.pdfIn PDF document text
- http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075900f3382f---33015904514.pdfIn PDF document text
- http://smflow.in/admin/uploads/file/nivugirinomodevix.pdfIn PDF document text
- http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19d81b799e---16280097873.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=graph+input+and+outputPDF 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_off0000db4a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB4A	17468 bytes
SHA-256: `9c628cddf27cac639f2f52e333dc5b507aa6f984d51f804b93654861a92fc400`
`font_01_sfnt_off0001093d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1093D	10280 bytes
SHA-256: `65abf4b8253725e97821a6c7d39e5e93437213a6c59586b79cb1d09497330288`
`font_02_sfnt_off00012044.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12044	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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