PDF malware analysis — malicious · 1fbb5deef185968f

MALICIOUS

PDF

80.5 KB Created: 2021-06-26 00:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: bcc23c734bbc3001c15e4fd54a507787 SHA-1: 187772abf62c196a4b7acedeea23edf06cbd6552 SHA-256: 1fbb5deef185968f14d00ba0b4724715e09dc8aff3659b3b1cc48729f30bab60

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a pattern of hosting malicious content on potentially compromised or low-reputation sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

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.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1ab376269---pubuwimilozisinujopivosox.pdf In PDF document text
- http://bagiez.com/userfiles/file/gokutomutezejakuwekot.pdfIn PDF document text
- http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/97143833142.pdfIn PDF document text
- https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/831ea335e6547cfef5fd524f849fbffe/51215469404.pdfIn PDF document text
- https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/8381dd7282ba1a7e281f9fc54a69f459/javilebosoz.pdfIn PDF document text
- https://anandamsanyal.com/userfiles/file/5758672858.pdfIn PDF document text
- http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160871239389f6---sipalujokolalemufoja.pdfIn PDF document text
- http://3e-recycling.ru/app/webroot/filesfiles/sufudafulopelawa.pdfIn PDF document text
- https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/b8c2942a3ee1af77396efc2ce230ca90/mufudisagirapuwotomajo.pdfIn PDF document text
- https://smilepaper.tw/archive/upload/files/witogatotabasabom.pdfIn PDF document text
- http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aee16ad74---35110452439.pdfIn PDF document text
- https://aduanaldelvalle.com/userfiles/file/82133185741.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871c42b0029---kinavafip.pdfIn PDF document text
- http://wsp.pl/userfiles/file/89642150644.pdfIn PDF document text
- http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c353be92566---tetizoxivevi.pdfIn PDF document text
- http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160ad19d75737a---16123685907.pdfIn PDF document text
- http://goref.ru/files/file/2310585909.pdfIn PDF document text
- https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/2ce60037f3d3a9ec5738e39ed74d16c9/venaxunajaw.pdfIn PDF document text
- https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608024ddd0f9a---58151745635.pdfIn PDF document text
- https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/7daac481ab3385ffaa1d7efcb1a818bc/vujuruxovuzumeto.pdfIn PDF document text
- http://cdhsalumni.com/clients/28864/File/tejoxutonarasatajupomumu.pdfIn PDF document text
- http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/valfqglguam3gji40toeppgbjn/8889703406.pdfIn PDF document text
- https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/59e0a9a4840eaaebdf7ab59080d6e212/98170692585.pdfIn PDF document text
- http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160852befbfa8a---fojupagoxorofisadagajuto.pdfIn PDF document text
- https://brs.jo/userfiles/files/39139982278.pdfIn PDF document text
- https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f1dbba6f7---55087011512.pdfIn PDF document text
- https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/6a091d6902b26aa7f9ef0c12137f2a32/28951887751.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=elementary+analysis+theory+of+calculusPDF 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_off0000d717.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD717	10800 bytes
SHA-256: `60133461c060d67d67f5a24b6028d14ebbc501b918e536037701f8ffe4b64763`
`font_01_sfnt_off0000efcb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFCB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000107dd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107DD	17196 bytes
SHA-256: `d44b30f3bea53bd4d52ac5946adefbb8fd567908ef2541ccd8592c98672745e9`

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