PDF malware analysis — malicious · 72625a625c97b942

MALICIOUS

PDF

88.2 KB Created: 2021-07-06 11:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 414caf78a3d186de68d2cfe2bf98d304 SHA-1: 84957526e8a99e7f39911fcbafe1dc7ca625791c SHA-256: 72625a625c97b94200556481380bc6b51c45e965f9fe371d1e88431930a292c4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, often associated with phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns strongly suggest a phishing or malware delivery attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://irlanc.ru/uplcv?utm_term=without+stopping+nyt+crossword PDF link annotation
- https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/85b5751acd3dbdf1c6d5901bba9d5fed/70849128747.pdfIn PDF document text
- https://zoomkish.com/basefile/zoomkishcom/files/62679076472.pdfIn PDF document text
- https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/c777b46ce247d0ca459f8a76783483a6/senanajagokiretivag.pdfIn PDF document text
- http://ecole.ru/text/images/file/81902201545.pdfIn PDF document text
- http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092dabf0f858---dipediwisovenad.pdfIn PDF document text
- http://dermatologomiguelgallego.com/miguel/fck/file/51947042212.pdfIn PDF document text
- https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0263dac8---64413660106.pdfIn PDF document text
- https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/1008067064610991270091fa3945e64f/31809191066.pdfIn PDF document text
- https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ff0417b7dc92f9c2df3f727bf48041a5/denetidipabisi.pdfIn PDF document text
- http://ilkemymm.com/image/files/sagekanakovijilaputi.pdfIn PDF document text
- http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160760b94e6601---73390596555.pdfIn PDF document text
- http://dzstock.com/Upfiles/file/befatimogotawuvow.pdfIn PDF document text
- https://bettyloupaints.com/userfiles/files/tamamokajafovabo.pdfIn PDF document text
- https://superpart.com/files/xawalurivaretunavowovix.pdfIn PDF document text
- https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/da01ed1b7a3fdbc7be2d44a409701934/folevopo.pdfIn PDF document text
- https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094030b58767---95468556794.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/q9iano2l6d90eqfrkn8iea91d7/pividudejuzojidu.pdfIn PDF document text
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d4573235875---ratow.pdfIn PDF document text
- http://technoculture.cz/admin/upload/file/84790138467.pdfIn PDF document text
- https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/3ba55eccc85cbe8e441f03aa912213c7/palalimamix.pdfIn PDF document text
- http://indovinandoilmondo.it/themes/userfiles//files/rakuga.pdfIn PDF document text
- http://dungcubepgiangtrinh.com/webroot/img/files/4870363119.pdfIn PDF document text
- http://portalcom-b2b.es/img/user///file/_0437369001624495412.pdfIn PDF document text
- http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898030b7eac---xobisewiluzajifo.pdfIn PDF document text
- https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/668a44c00394ab88adc43aa4780d10b8/65110431144.pdfIn PDF document text
- https://amatnieks.com/pictures/image/50498418368.pdfIn PDF document text
- http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9d110355a9fabdfd493fa7fee210fc26/69944959283.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_off0000f190.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF190	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000109a7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109A7	10744 bytes
SHA-256: `65dc5a17e844dd6e4ded3c927252a8d26774ab87cb9a6779b1145b9d53068ad1`
`font_02_sfnt_off00012238.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12238	18016 bytes
SHA-256: `72f2c9791d957ea77c41b9fc8a8934635868a32e6cea815bf93f983c26302797`

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