PDF malware analysis — malicious · bc59b481a67b051b

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 22:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 4d5acb9047ba063314a0a96182c14f03 SHA-1: c4865a30bad149e29e4b8116761a990376af69d2 SHA-256: bc59b481a67b051ba0d93538fcbc629c8c70e79d6fa0140d8d640ba32a580082

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. No scripts were extracted, but the PDF structure and numerous external links are indicative of a phishing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://oniceh.ru/uplcv?utm_term=genial+klick+a1+lehrerhandbuch+pdf PDF link annotation
- https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/9u5pnn4qbgoamed5ijlgpieir3/8104048693.pdfIn PDF document text
- http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b76427c1b10---22992622904.pdfIn PDF document text
- http://www.mediagrand.hu//data/editorfile/fozojisumutekowawu.pdfIn PDF document text
- https://firsatpin.com/calisma2/files/uploads/27074005922.pdfIn PDF document text
- https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089eb4b0e461---xozikigutevi.pdfIn PDF document text
- https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/3a2597f3c87b614d61047d4a35df7785/95204017964.pdfIn PDF document text
- http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744b2ce8485---61843467186.pdfIn PDF document text
- http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/1b1381455c8b48f161fe250a946ece83/jekegonepikubewuwup.pdfIn PDF document text
- http://robinsonfamilyreunion2021.com/clients/7/77/7769cd5c98d63cfb9738ae2db1c5c42c/File/gejekexosu.pdfIn PDF document text
- https://nic-irq.com/userfiles/files/50390946342.pdfIn PDF document text
- http://giasuminhtam.com/Images_upload/files/33337947901.pdfIn PDF document text
- http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/kalunabeti.pdfIn PDF document text
- https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cb51b7ebf---57857849232.pdfIn PDF document text
- https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/12b37a08becfc2b261ff44d2073862ad/kafodutudilifilenav.pdfIn PDF document text
- http://immobilieninvestors.eu/userfiles/file/birebojesulemegupusapi.pdfIn PDF document text
- http://reckdance.pl/userfiles/file/66158762888.pdfIn PDF document text
- https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/622b52ea32faa051fd6d6f8dafcf346e/95477681686.pdfIn PDF document text
- https://adikkeempat.com/contents//files/5264924096.pdfIn PDF document text
- https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/5f95156642b2547f9a6928ebfcd6f4c5/17096194077.pdfIn PDF document text
- http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608520eacddf6---83381350022.pdfIn PDF document text
- https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c85ae2dcc---parodo.pdfIn PDF document text
- https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/cvtsjnrip1j6ak6q3f3qlnju73/17105605749.pdfIn PDF document text
- http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3be6b8baa5---lemunaxisaf.pdfIn PDF document text
- http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e50789ee3---vixura.pdfIn PDF document text
- https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a2e2d670b---22117563324.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_off0000cb5d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB5D	10756 bytes
SHA-256: `1b18b530bc23b501f449e049765f9ccc9379a6308ccd647a9d9431e1f9404b6b`
`font_01_sfnt_off0000e3cb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE3CB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fbdd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBDD	21204 bytes
SHA-256: `aa283e3e98a500af6d08a0a08e5b02cd6fb967184f53560694aa1e7484527d41`

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