PDF malware analysis — malicious · f70c00a5d9234a10

MALICIOUS

PDF

85.7 KB Created: 2021-07-05 22:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 6c4b4e57d129775b2344548019b926b7 SHA-1: 232a34c1791fac441dc7f32175d037d6234f87f5 SHA-256: f70c00a5d9234a10901f72810f7455ce0588bcc2e51cc5816059093489dcf355

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected by ClamAV as 'Pdf.Phishing.Trojan'. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites. The ML classifier also flagged it with high confidence. The document body is heavily obfuscated and does not provide clear instructions, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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 http://abwingssuffolk2.com/uploads/files/nabasasowemowi.pdf In PDF document text
- http://mclarenquartz.in/ci/userfiles/files/sidokudoxajikasalom.pdfIn PDF document text
- https://alakharia.com/public_html/userfiles/file/68261197417.pdfIn PDF document text
- http://ipceurope.eu/assets/file/togidowugududufejisopeber.pdfIn PDF document text
- http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606faa2933267---61860667887.pdfIn PDF document text
- http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d04ef35211---pabazapajobenijejuga.pdfIn PDF document text
- https://brod-plovdiv.com/images/linoteviluxata.pdfIn PDF document text
- https://groupburuemas1.com/contents//files/suxasesirepuxewigatux.pdfIn PDF document text
- http://mkbeauty.vn/luutru/files/fazotelozid.pdfIn PDF document text
- https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ee2afaf5ecc7f00ae257f784d558b9dc/sinefonosediwura.pdfIn PDF document text
- https://daaeportrett.no/upload/file/43489049285.pdfIn PDF document text
- https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a40f15233d90b7409f2ab73702f980c/75481452666.pdfIn PDF document text
- http://franzoesischebulldoggen.eu/userfiles/file/7021140700.pdfIn PDF document text
- http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780918310a6---gekikogepiwam.pdfIn PDF document text
- http://elitvorota.ru/f/file/gavejunabogaboxibuj.pdfIn PDF document text
- http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862d160dfea---67812086802.pdfIn PDF document text
- https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/dc8burevdqao1j21bc7g09t982/92849863199.pdfIn PDF document text
- http://entone.es/wp-content/plugins/super-forms/uploads/php/files/136f8e561c48abbe13d128571bacf0d7/poporuxuduvodatototevixe.pdfIn PDF document text
- http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16083aa648f7e0---gonanopewijisunoxot.pdfIn PDF document text
- http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaa91aace8---20263648154.pdfIn PDF document text
- https://zoomkish.com/basefile/zoomkishcom/files/redurokoxasovizujelajoga.pdfIn PDF document text
- http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160826ad55ddc4---nafaxegiwurisu.pdfIn PDF document text
- https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f058f3f5e---92874645867.pdfIn PDF document text
- https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/7601fd4953d3ed2ff39eda234d109bc5/vetuminine.pdfIn PDF document text
- https://embassyinvietnam.com/webroot/img/files/77012440803.pdfIn PDF document text
- https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/4ng4e4rp4b7lajlsb0kq4sg8k5/suleniwonebesizakuwot.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=partial+paralysis+is+calledPDF 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_off0000ead9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAD9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000102eb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102EB	17752 bytes
SHA-256: `73113fe9d71560288a93b10b48939deaa934bc36c4248b2c812d6448913f9212`
`font_02_sfnt_off00013032.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13032	10400 bytes
SHA-256: `63a34bc2b7dacbca07b1f4755125a25b48961a1902baf5fbc63dd7d5817cb1df`

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