PDF malware analysis — malicious · c608dcfb75994389

MALICIOUS

PDF

81.2 KB Created: 2021-07-03 10:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 6fd8972aba88dfca294ffd40f6593fc4 SHA-1: a4b14a4c9f6cb9ffed8d869c05081416ab032a87 SHA-256: c608dcfb7599438912e144a94594c1773f0729e23bba9a2ee508fac9d78000c7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of external URIs and a high ML score indicate a strong likelihood of malicious intent, possibly involving the exploitation of PDF vulnerabilities to execute code or redirect the user.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d83c54548---86823470584.pdf In PDF document text
- http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5acf39fb5f---50456343124.pdfIn PDF document text
- http://www.bluewhaleline.com/image/upload/File/56967238826.pdfIn PDF document text
- http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081069039d78---kadesibimaso.pdfIn PDF document text
- http://maihome.hu/admin1/file/39274645724.pdfIn PDF document text
- http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32f59701cc---58502498292.pdfIn PDF document text
- https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/jiu577t2gcej81br2idagb74ib/likitofomirazepaz.pdfIn PDF document text
- http://innotec-industrie.be/userfiles/file/muvibipusekoxakugelubim.pdfIn PDF document text
- http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c70934c4bd8---zidanamegodexopumavalalo.pdfIn PDF document text
- https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/469de7bd6040cea2bd536596693889ab/jowajesepalu.pdfIn PDF document text
- https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fef0a8596---gimogudinolekesuretoneram.pdfIn PDF document text
- https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/ddc2617f411a6344a615e65124bbe1a7/fodowipuzo.pdfIn PDF document text
- http://scro.ru/pic/file/rebozojariwozeresuzuwat.pdfIn PDF document text
- https://haps.company/wp-content/plugins/super-forms/uploads/php/files/13o0pshp35nvhpejfumvuaq752/67423093561.pdfIn PDF document text
- https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607808521d964---vadekukawoxuf.pdfIn PDF document text
- http://mp-hd.de/data/aktualnosci_imgs/file/68944185594.pdfIn PDF document text
- https://delaneyllc.com/ckfinder/userfiles/files/padibugopejisepap.pdfIn PDF document text
- https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/12465621fa803c7e54939d4f02e1d123/66890744966.pdfIn PDF document text
- http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe4b05ca24---5230616053.pdfIn PDF document text
- https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c94248c281---2121728188.pdfIn PDF document text
- https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/9f53856c5c1ce432e6c640310aa09bf4/51008323740.pdfIn PDF document text
- http://ypdtools.com/ckfinder/images_store/files/babevomanopobubivadila.pdfIn PDF document text
- http://bud-drog.pl/userfiles/file/56677076342.pdfIn PDF document text
- http://kompletucetnictvi.cz/files/file/tujaga.pdfIn PDF document text
- http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dei0q6i851oajk61pld48do7i5/29417192209.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=thinking+mathematically+4th+edition+answersPDF 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_off0000d8eb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD8EB	17224 bytes
SHA-256: `16ac25e77753d43e97d27da4d9ef311b86337fabb971897520a9e50a517ce846`
`font_01_sfnt_off0001056f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1056F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011d86.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D86	11148 bytes
SHA-256: `5f8e4252bf0fe7445a7b19fd85f7b8d32f2a4eb4be012475d51f903fe635c73e`

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