PDF malware analysis — malicious · 9163d4899c4a20b6

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 23:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 6164f50bec5a49452d46297cdd5a3051 SHA-1: 237725771969f40d569481c235275c467174d928 SHA-256: 9163d4899c4a20b6866201c24c7b0fa2c1ddb3a31ca1ba8cdf0c6eae1d424c49

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm is a common tactic for distributing malicious content or leading users to phishing pages.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://sochi-polyana.com/ckfinder/userfiles/files/3070201601.pdf In PDF document text
- https://r4binsh4h9-att.com/contents/files/vokitevezoja.pdfIn PDF document text
- http://tetrafluoro.com/upload/files/tulefevipudob.pdfIn PDF document text
- http://samtle.net/ckupload/files/pepimadugeviwovavi.pdfIn PDF document text
- https://posetili.ru/userfiles/file/lutevuli.pdfIn PDF document text
- https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/fcedffa37fe70497214d5f386a2cb88f/fegobekaguzudodap.pdfIn PDF document text
- https://globalathena.com/ckfinder/userfiles/files/tuxaxajatupufalotomi.pdfIn PDF document text
- http://globalroomplus.com/bot/ckfinder/uf/files/7484178885.pdfIn PDF document text
- https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/26dd06722a42296de422becc0eb99f28/pepudosixojaxawulovugor.pdfIn PDF document text
- https://aviseco.ro/userfiles/file/41933931518.pdfIn PDF document text
- https://nk-sostanj.si/files/file/13250606168.pdfIn PDF document text
- http://uchid.com/uploads/file/3622410115.pdfIn PDF document text
- http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402d52d1dc6---tixulusalitunobaxesefima.pdfIn PDF document text
- http://xn--4k0b43gkwo4gn.com/upload/editor/file/16280969179.pdfIn PDF document text
- http://rustproofingottawa.com/userfiles/file/22250283961.pdfIn PDF document text
- http://finadev-groupe.com/userfiles/file/katumobisilakevugopulak.pdfIn PDF document text
- http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ac86ba6d5ec9a0671f59a393e058b486/nizudo.pdfIn PDF document text
- http://myappartement.de/web/editor/files/tituxivutitirejirizu.pdfIn PDF document text
- https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/viwimaper.pdfIn PDF document text
- http://tai-yang.tw/taiyang/upload/file/jejekajutaxilemej.pdfIn PDF document text
- http://ettorebelfioreliutaio.it/userfiles/files/zojupaburatosezuvigag.pdfIn PDF document text
- https://lifeteacher.tw/uploads/files/202109130801447964.pdfIn PDF document text
- http://tourbusan.net/FileData/ckfinder/files/20210905_8E683363EB06E026.pdfIn PDF document text
- https://shopexpert.com/app/webroot/files/userfiles/files/volamafinaz.pdfIn PDF document text
- https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/5734ef0c6dc995dcff01df8834a9d2dd/72628942967.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ads+on+my+android+phonePDF 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_off0000b516.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB516	14732 bytes
SHA-256: `306534eb2927dd06f4ed4e21336d59f56bad2ba65ea36459a7dc9bd7f2bc47d0`
`font_01_sfnt_off0000da07.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA07	10608 bytes
SHA-256: `764ec9f8c85a5e429c68b3bbb12eb486da2370af843303fa733a477c39ad0f69`
`font_02_sfnt_off0000f20f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF20F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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