PDF malware analysis — malicious · c8ffb7f88f8e0db1

MALICIOUS

PDF

84.1 KB Created: 2021-08-21 09:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29

MD5: 901e2d09060ad6329cf2472bf30c75fb SHA-1: 06809869d49319de0dc20a9ee79c4400e5eed591 SHA-256: c8ffb7f88f8e0db1abd6f0b5df39116f85abbdb3d114608975dcc72d69ac7cae

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 high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9983

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://catamma.ru/uplcv?utm_term=dividing+polynomials+worksheet+with+answers+pdf PDF link annotation
- https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/ssim61sp3qm84d6g3l9nghmd61/14949190294.pdfIn PDF document text
- http://birkhoffhi.com/userfiles/files/19485485802.pdfIn PDF document text
- http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609114e219aac---27697866224.pdfIn PDF document text
- https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa846b71a82---vefuxesiluxerudir.pdfIn PDF document text
- http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5421cea22---lexuruwimu.pdfIn PDF document text
- https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/d9ad1bbfd69fb72733f06b0a4caca10e/62877466575.pdfIn PDF document text
- https://soudurelausiere.ca/upload/editor/file/fusizipimegupidil.pdfIn PDF document text
- http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ad24eefdb---17301774012.pdfIn PDF document text
- http://2440027.ru/upload/file/39610367053.pdfIn PDF document text
- http://dancedynamicsla.com/clients/38740/File/zumobaw.pdfIn PDF document text
- https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf859f5476c---95750657827.pdfIn PDF document text
- http://dok-vo.ru/userfiles/file/78984031483.pdfIn PDF document text
- https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160956ca150ba3---midusaxizudavobafoka.pdfIn PDF document text
- http://cfacgroupe.com/uploads/FCK_files/file/51775821858.pdfIn PDF document text
- http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/xusidosaralukubomu.pdfIn PDF document text
- http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e061f9ae420---79034478491.pdfIn PDF document text
- https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ff4d79579---7172239394.pdfIn PDF document text
- https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/2f3e9758d193aaa05afd734368e49012/70401613397.pdfIn PDF document text
- https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a703cb5c7---8248197512.pdfIn PDF document text
- https://horizontire.com/userfiles/file/zejejumajesopexus.pdfIn PDF document text
- http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099dbb14b627---71423793361.pdfIn PDF document text
- http://ukicda.com/admin/fckeditor_upfiles/file/2021081710455180554.pdfIn PDF document text
- http://accessprecision.com/userfiles/file/jefomajuxozelakerubo.pdfIn PDF document text
- https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/1252ba2gljfh2rfv971vbebj5l/vujemegoxet.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_off0000e350.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE350	11304 bytes
SHA-256: `8f59ed6651d239521a7de516894039f008f9343b84d983930b7ee2a2442641e9`
`font_01_sfnt_off0000fd8b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD8B	16884 bytes
SHA-256: `b6d08c673f62d145e5aaac0a4fee9e90239e30fba7da3687fab3c33caed98ef3`
`font_02_sfnt_off00012999.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12999	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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