PDF malware analysis — malicious · 672f6ca70d239fb5

MALICIOUS

PDF

86.9 KB Created: 2021-09-06 15:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 994ddd63a470bb60db65a5908da2616a SHA-1: e459d10a816a5f92cb75433171bc3528d9732e5b SHA-256: 672f6ca70d239fb5574106311d56838864122d1cd3348c05955169f3c3642278

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains a link farm pointing to compromised WordPress sites, which host other PDF files. These links likely serve as a lure for phishing attacks or to distribute further malware. The use of compromised CMS upload storage indicates a tactic to host malicious content on seemingly legitimate domains.

Machine Learning

Nyx PDF Classifier malicious score 0.9635

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://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c2c2406637---29915298578.pdf In PDF document text
- http://szjglaw.com/uploadfile/file/2021072114080173499.pdfIn PDF document text
- http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/31903106918.pdfIn PDF document text
- https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081062de2aa5---vojevitiwazomugik.pdfIn PDF document text
- http://e-instar.com/userfiles/file/gilugibizirinemisozut.pdfIn PDF document text
- https://ready4use.ru/uploads/files/kitugopotomepesesutason.pdfIn PDF document text
- http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f5fb33d7b---bizimigidomazoragijuliseg.pdfIn PDF document text
- http://seritour.com/rsm/files/borabubemowofovaxesubujog.pdfIn PDF document text
- http://alpanelektrik.com/depo/sayfaresim/file/jizane.pdfIn PDF document text
- https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/83401082960.pdfIn PDF document text
- https://directorvincentchow.com/fck_filemanager_upload/file/lusuxelimufub.pdfIn PDF document text
- http://nsk-nalogov.net/upload/files/7094816052.pdfIn PDF document text
- https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8155c9793b---77831180254.pdfIn PDF document text
- https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/hm5ec6c9evrt54a1rp4b104c8u/delevinasuzoporebewefo.pdfIn PDF document text
- http://kulturazebrak.cz/userfiles/3556239515.pdfIn PDF document text
- https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/nkqrod875iamq64nj80tc84s3q/59718178876.pdfIn PDF document text
- https://kermanrooz.com/img/files/zeneziradipod.pdfIn PDF document text
- http://uro-medical.pl/zdjecia/fotki/file/93605464214.pdfIn PDF document text
- http://pantryscan.com/123cars/imagefck/file/jajotevojipabim.pdfIn PDF document text
- http://dienmaythanglong.org/uploads/files/regube.pdfIn PDF document text
- https://xanbiente.de/userfiles/file/zaxipazafoxukixupilu.pdfIn PDF document text
- http://busankid.com/webfiles/board/file///79391470540.pdfIn PDF document text
- http://alemotta.com/resources/original/file/9246986050.pdfIn PDF document text
- https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/665bd17a6eaae2e45151ad058f33b87f/popujiwiluwezir.pdfIn PDF document text
- http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b54ce4ecad0---jefexigubijapo.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ysr+navaratnalu+in+telugu+pdf+free+downloadPDF link annotation
- https://mediaget.com/userfiles/files/54456616407.pdfIn PDF document text
- 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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c21f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC21F	1868 bytes
SHA-256: `b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8`
`font_01_sfnt_off0000cad1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCAD1	16164 bytes
SHA-256: `a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1`
`font_02_sfnt_off0000e072.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE072	22588 bytes
SHA-256: `34a4c15111620d00b9310a011a9ae52f3cbecd53ae07bbdae31c5bde3fc6b4e9`
`font_03_sfnt_off000119a9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x119A9	10908 bytes
SHA-256: `d113e1e9456cf0552373c69ae69895bfc1ed24763586133a8176c7cde15de7ef`
`font_04_sfnt_off000132da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x132DA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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