PDF malware analysis — malicious · 3408be070d30c642

MALICIOUS

PDF

92.6 KB Created: 2021-09-03 13:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: ce41a94b5197da00bacb03bb6945d1b1 SHA-1: 762c09a419e0a5d94ae2a34ad75fae5510d6a2f2 SHA-256: 3408be070d30c642d05ded817e5730e474ccc6e40897af2d29315927ab72d074

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. Heuristics indicate the PDF acts as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting, likely to obscure the final destination. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external sites, potentially for credential harvesting or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9924

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://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f2ee72f63---bevijiviw.pdf In PDF document text
- http://ankamet.com/userfiles/file/84915310768.pdfIn PDF document text
- https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/81381228403.pdfIn PDF document text
- http://www.kigimex.com.vn/ckfinder/userfiles/files/wonitibukusunijujunaxaki.pdfIn PDF document text
- http://vmkmsz.hu/userfiles/file/93237489515.pdfIn PDF document text
- http://hferrynetworks.com/FileData/ckfinder/files/20210807_C869DF552E517F4E.pdfIn PDF document text
- https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22344c1551---26296672768.pdfIn PDF document text
- http://drapikowski.pl/uploaded/fck_files/file/77180431297.pdfIn PDF document text
- https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd5ebae362---54302878649.pdfIn PDF document text
- https://sbsoftware.ro/admin/userfiles/file/zozufawoxoxewu.pdfIn PDF document text
- http://klasykarozrywki.pl/public/images/fck/file/nevojuvebewaputuxenivap.pdfIn PDF document text
- http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc4614d62a---jubibimujitodilubaxevu.pdfIn PDF document text
- https://korzo-galeria.hu/files/file/54106179508.pdfIn PDF document text
- https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/661633f8c8d5ed20c2021eb6993957df/bawejinizabexa.pdfIn PDF document text
- http://gianniarnaudo.com/userfiles/files/vilibifonujopatijig.pdfIn PDF document text
- https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/157cebc51f68efde13b259766fc264f7/fejanawowamelazifisesanig.pdfIn PDF document text
- https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160822be74f299---damidugufexevobalizujerir.pdfIn PDF document text
- https://people11people.gr/uploads/File/fofilapoliwogitog.pdfIn PDF document text
- https://makojudo.pl/zdjecia/fck/file/mokedevijamofaxariremefi.pdfIn PDF document text
- http://pincailight.com/zk/UploadFile/file/2021081606495973499.pdfIn PDF document text
- http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a749f3378bc---76913712752.pdfIn PDF document text
- https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf90de3bf30---32309484792.pdfIn PDF document text
- http://premium-h.info/files/files/dexevenasewobomafafodaven.pdfIn PDF document text
- https://jdlpartnerss.com/userfiles/file/5674033266.pdfIn PDF document text
- https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/saxov.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=rain+bird+5000+series+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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e000.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE000	10732 bytes
SHA-256: `f83e9d57bd6decf5ca4c524ed5bcdeaa4f656977c5d4998849d17db619424e29`
`font_01_sfnt_off0000f89c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF89C	21412 bytes
SHA-256: `4afdd39eaaff91215d235bcd5ae731d834c04bedc6f1bd4ef79f776af65b2970`
`font_02_sfnt_off00012f2f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12F2F	18512 bytes
SHA-256: `57e085d612b96c30f3c3fd8d988435fe27b465b0eed98f1c42a88939467283df`
`font_03_sfnt_off00014c80.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14C80	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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