PDF malware analysis — malicious · 81752c370c3dcfc6

MALICIOUS

PDF

94.6 KB Created: 2021-10-01 22:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 4abaada086cddca9a04f9ad987ad1246 SHA-1: bb4727b432889c46417cdb3c2ef1d19e50ce8a52 SHA-256: 81752c370c3dcfc6c6e9850ce448619a00b230bf06da1bf00f321629c3c33ba6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document techniques.

Machine Learning

Nyx PDF Classifier malicious score 0.9761

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://wastran.ru/uplcv?utm_term=shabnam+bangla+choti PDF link annotation
- http://czerwoneiczarne.pl/files/file/lexogeguwowesenitidip.pdfIn PDF document text
- https://membermimpi.com/contents/files/vusadosugezunisagekamu.pdfIn PDF document text
- https://ferado.vn/userfiles/file/batevenazukumifokop.pdfIn PDF document text
- http://luckysim.com/userfiles/file/33470532303.pdfIn PDF document text
- http://www.hussco-steel.com/husscofiles/files/40330358822.pdfIn PDF document text
- https://rugsdirect4u.com/uploadedfiles/file/zukopapefik.pdfIn PDF document text
- https://adetexfoamgroup.centralcms.cloud/galeria/files/87521683420.pdfIn PDF document text
- https://mgogs.com/mgfiles/file/62797258585.pdfIn PDF document text
- http://vsrru.ru/userfiles/file/80712488499.pdfIn PDF document text
- https://bahamianbrewery.com/ckfinder/userfiles/files/nuvasobijixozekami.pdfIn PDF document text
- http://cesishotel.lv/res/wysiwyg/file/mesirofudapeg.pdfIn PDF document text
- http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/vulepozixolosegafovorodat.pdfIn PDF document text
- http://dienmaythanglong.org/uploads/files/mivaduwekugotidu.pdfIn PDF document text
- https://funbugs.ie/files/file/2508221202.pdfIn PDF document text
- http://tongchangkj.com/uploadfile/file///2021092810293243.pdfIn PDF document text
- http://motocams.cz/ckfinder/userfiles/files/rerin.pdfIn PDF document text
- https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/f66b00fe1a0cf99d64890930a95d36e8/zaterap.pdfIn PDF document text
- http://kossuthdigisuli.hu/userfiles/file/95267267967.pdfIn PDF document text
- https://jerseyshorepirates.com/userfiles/files/40665578294.pdfIn PDF document text
- https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/dexugeketakagapozamebid.pdfIn PDF document text
- http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/a9g3s6ugu34596qbslpou1bjq5/xodesiko.pdfIn PDF document text
- http://chayka-svg.ru/files/57528221136.pdfIn PDF document text
- https://technoarc.net/userfiles/file/201701197.pdfIn PDF document text
- http://lovesenergy.com/file/kubiteranuzes.pdfIn PDF document text
- http://finance-bulldog.cz/UserFiles/File/68050945580.pdfIn PDF document text
- http://mengnuanua.com/app/webroot/files/files/72587073748.pdfIn PDF document text
- https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/fbf36880a1f74755c901e1fb2d0a1ba6/totogedigibugixukanolepav.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_006_off000152b1.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x152B1	16788 bytes
SHA-256: `e4963c4b2441adc0bb0207f5f728746328a13d406d3b2ddd9573a6bcd804c1ab`
`font_00_sfnt_off0000ea28.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA28	22252 bytes
SHA-256: `b7adc857585a5e13850fc85c8a74c82dab49fd8eddf795947a0c147db61fed64`
`font_01_sfnt_off000122fb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122FB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013b12.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13B12	10492 bytes
SHA-256: `0f00fd44bd293e31aadfaffa39d2c4cc59cc50fe6fe6a5879fc338ab1b4fe56f`

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