PDF malware analysis — malicious · 7c80cd3ff8f32b47

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 17:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 98994e035841ff7c309ed769aaa72eca SHA-1: d85dd6c57db5bbe3c15512c279237d4193680899 SHA-256: 7c80cd3ff8f32b47c529a9f72389b383aa7754e61b324e4a8a6137caa126c0bf

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many of which are part of link farms on disposable hosting or compromised CMS uploads, suggests the document is designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF format and the nature of the URLs strongly suggest it's a phishing lure or a downloader for further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://ketchas.ru/uplcv?utm_term=cellular+and+molecular+immunology+9th+edition+pdf+download PDF link annotation
- http://mikomisushiwc.com/uploads/files/53000162095.pdfIn PDF document text
- http://shrlie.com/upload_fck/file/2021-9-4/20210904124742221808.pdfIn PDF document text
- https://motiwalainstitutes.org/userfiles/file/30772518719.pdfIn PDF document text
- https://mami-m.com/Uploads/userfiles/files/gazuge.pdfIn PDF document text
- https://majorsagilekvaros.hu/uploads/file/20107714087.pdfIn PDF document text
- https://indirimlipin.com/calisma2/files/uploads/72530754375.pdfIn PDF document text
- http://jagodkaprzedszkole.pl/userfiles/file/46872125309.pdfIn PDF document text
- https://dianthusindustrial.com/resimler/files/baralifikadevikepamoxa.pdfIn PDF document text
- http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141946648cc6---toxokagizo.pdfIn PDF document text
- http://2990592.ru/ckfinder/userfiles/files/murodupegirodoluwa.pdfIn PDF document text
- http://maasmartcity.com/userfiles/file/varuzasibilirukibapenamo.pdfIn PDF document text
- http://tantusmarina.com/UserFiles/file/golegeg.pdfIn PDF document text
- http://mrukseo.pl/userfiles/file/vusizutamiw.pdfIn PDF document text
- http://chnli.tw/CKEdit/upload/files/56181268473.pdfIn PDF document text
- http://stisk.com/file/mewowupagigikikutaf.pdfIn PDF document text
- https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/97663256597.pdfIn PDF document text
- http://allineers.morefriendship.com/upload/files/53387370669.pdfIn PDF document text
- https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8e4a2c863841da1a3a94ae0bc061d24a/nafafakazup.pdfIn PDF document text
- https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b24248d2aa6c987d3b3c99ab6fcd9592/62645527603.pdfIn PDF document text
- https://greenboo.vn/uploads/files/35929045381.pdfIn PDF document text
- http://miyozenemeryville.com/uploads/files/botevunekirenolewatukizog.pdfIn PDF document text
- https://pensiunea-escape.ro/ckfinder/userfiles/files/rimexilijekazoxexubanuxu.pdfIn PDF document text
- http://yakutiaprime.ru/SITE/files/editor/file/81703829980.pdfIn PDF document text
- http://studiotecnicopinto.it/userfiles/files/xizafe.pdfIn PDF document text
- https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a0569c1d1a63b03fab2cb86c6757a041/bazilek.pdfIn PDF document text
- http://lightningriskassessment.com/ci/userfiles/files/betaguzo.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d23e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD23E	17272 bytes
SHA-256: `a802f72554d5101dc4b1c5adaf51e76df3956aaefefe708f48884a896fab7cb6`
`font_01_sfnt_off0000ff34.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF34	11400 bytes
SHA-256: `47e05d1c6e6a37bb628aa68baaf572ba20693ab287b441f0d6067f428b294086`
`font_02_sfnt_off000119c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x119C6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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