PDF malware analysis — malicious · 4f5d468946811885

MALICIOUS

PDF

94.5 KB Created: 2021-09-06 13:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: f2cffa39c96666d634e4b1f034a1d2c7 SHA-1: a2a42828c460829f4f1c0eb997465999323c921e SHA-256: 4f5d468946811885e5bd71276d72d2f436dd4b53baa068ce3a5979e83c0d69d4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The presence of PDF-specific heuristics suggests it exploits PDF vulnerabilities or uses PDF features for malicious purposes, likely to facilitate phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9820

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://bcbc3399.com/upload/files/moteme.pdf In PDF document text
- http://spreewaldatelier.de/img/editor/file/56417603670.pdfIn PDF document text
- https://angkagenap.com/contents//files/tuzipufuke.pdfIn PDF document text
- http://breakevenpoint.pl/uploads/editor/file/80816712430.pdfIn PDF document text
- http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nikalesomekovaxujubex.pdfIn PDF document text
- http://pc75.net/upfiles/file/1622228245.pdfIn PDF document text
- http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30802168461.pdfIn PDF document text
- https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cce26b8ec4---52041992626.pdfIn PDF document text
- http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b698d8b68---gifavasowiped.pdfIn PDF document text
- http://sahamit.net/userfiles/file/xumakikujexovo.pdfIn PDF document text
- http://abacusnancy.com/userfiles/file/ginovezifinafepekudibul.pdfIn PDF document text
- https://baxsporthorses.com/userfiles/file/64980921874.pdfIn PDF document text
- https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/2c277faaae0a3465f853ae17e56281cb/2031648415.pdfIn PDF document text
- http://jagatjyotischool.org/jagatjyotischool/userfiles/file/98692328765.pdfIn PDF document text
- http://teplospectr.ru/images/files/39535776618.pdfIn PDF document text
- http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/g5n778olb3i0sihdn16l0te5en/dexalakomomafisoxitip.pdfIn PDF document text
- https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd35bc723---zuliraferodewiraluwur.pdfIn PDF document text
- http://ducnhua.com/upload/files/3084196005.pdfIn PDF document text
- http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ljjbjnk0l5o9leqdllql2ehi60/werozojimimupudulubox.pdfIn PDF document text
- https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b9f40faaf---bisonigoluvunawevozi.pdfIn PDF document text
- https://angkalaris.com/contents//files/41881676825.pdfIn PDF document text
- https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/srtka7emjg5uq3glb7jkgmlp68/74445075006.pdfIn PDF document text
- http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/20163759034.pdfIn PDF document text
- http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070763a64b8e---14073790491.pdfIn PDF document text
- https://tsegypt.com/file/menojaxegebiwujevorom.pdfIn PDF document text
- http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941e4b09cbe---62165081022.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=hoopp+employer+administration+manualPDF 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_off00010c93.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C93	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000124aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124AA	10756 bytes
SHA-256: `209e43c0b10de75e7f96edac3853a565c0952ad5760bab0b088c6e5e17aaffde`
`font_02_sfnt_off00013d53.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13D53	18024 bytes
SHA-256: `0ae3088261efc66108ad7146f0609c01388aa1b91a2484f5f8d62c3f4c553cde`

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