PDF malware analysis — malicious · 7a9da47231fc1f93

MALICIOUS

PDF

89.5 KB Created: 2021-07-18 06:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: d8f3e850b89548cbe96d36c5783468f6 SHA-1: e2fdd5d67e3cc09997966e1eface19119f6ab356 SHA-256: 7a9da47231fc1f9388078b61826e9700639dfc87ba34d11ba8cdc5441f4230d9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage, with numerous distinct hosts and URLs, suggesting a phishing or malware distribution campaign. The presence of external URIs and a link farm structure strongly indicates an attempt to lure users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://kristenpell.com/userfiles/files/79127291634.pdf In PDF document text
- http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e123c383eb---malerapukibasag.pdfIn PDF document text
- https://aduanaldelvalle.com/userfiles/file/23134286323.pdfIn PDF document text
- https://whitesal.com/data/images/file/2783_20210622201211.pdfIn PDF document text
- http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e8b7412238c---87611743833.pdfIn PDF document text
- http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/95590141851.pdfIn PDF document text
- http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160765963c3982---lizutetafado.pdfIn PDF document text
- https://rjpexport.com/files/17687158516.pdfIn PDF document text
- https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b67acd3bf1538be4daf2838a37a58273/30825440088.pdfIn PDF document text
- https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c9589ecbe---dabetigumavev.pdfIn PDF document text
- http://samtekelektrik.com/files/19969206229.pdfIn PDF document text
- https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/m1tr6g6hgs69phim69km6gl770/dalusanogedegegoweko.pdfIn PDF document text
- https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aab7bf9e589---texizegas.pdfIn PDF document text
- https://kompaspt1.com/contents//files/todigodatutesaxupaf.pdfIn PDF document text
- http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724cdbaf60a---rewiwedozikarukoxafa.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f16f38767.pdfIn PDF document text
- http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160942184b3c44---gogibevanunisimokuvosopop.pdfIn PDF document text
- http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc7bb65e12---nomofixavunobipadoruxu.pdfIn PDF document text
- http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/31424061185.pdfIn PDF document text
- https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/2i1k894n8jcqjnai9fl9kdbm5k/78688484967.pdfIn PDF document text
- https://bestofbucerias.com/upload/file/30781342419.pdfIn PDF document text
- http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/zeluj.pdfIn PDF document text
- http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed36c8edb38---numodegisixi.pdfIn PDF document text
- https://majorsagilekvaros.hu/uploads/file/sirijexebebati.pdfIn PDF document text
- https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/6510a589b70dad2948ea46cec75254ef/roxidalu.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=summary+article+onlinePDF 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_off0000fb34.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB34	10512 bytes
SHA-256: `d095bade4b2eb24dfe80e04344cf6220e598788a7e4014a81ad6742edb06d968`
`font_01_sfnt_off00011327.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11327	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012b39.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B39	17404 bytes
SHA-256: `5f897e0ad82b3139af6b578d105b14efa1918c70496fa73a0a74fdde2a776561`

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