PDF malware analysis — malicious · 3447ad2bc185ad41

MALICIOUS

PDF

88.7 KB Created: 2021-08-11 13:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 074b3071186975b29eee664733e3655f SHA-1: 29342fda90f0f818841f11c5d86817d96ac9d244 SHA-256: 3447ad2bc185ad4127e23707440f2eab9d0c3559358bdfae47556dae4546078e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

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://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/42769105575.pdf In PDF document text
- https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a7386cdd6---57079615305.pdfIn PDF document text
- http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9012861de---rekigesufazikutalowe.pdfIn PDF document text
- https://www.funes.gob.ar/ckfinder/userfiles/files/69830428286.pdfIn PDF document text
- http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e16de9ba9---87330189110.pdfIn PDF document text
- https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/88f08d8dd48e79e335e4bc57b37d4dcf/refibijarer.pdfIn PDF document text
- http://oprandi.it/userfiles/files/wiwovifavedovozatidovojo.pdfIn PDF document text
- http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/v7e1gkoadf480ioh3653prdhr6/rosisiberumetalazofixa.pdfIn PDF document text
- http://nemdanangpho.com/uploads/2021-06-16/images/files/71223432659.pdfIn PDF document text
- https://coluer.ir/documents/file/masuwuxin.pdfIn PDF document text
- http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/6869798572.pdfIn PDF document text
- https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/mjn6b40v78ijfcp1l22djvt71h/bedozekipekozofewetu.pdfIn PDF document text
- https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/1nf5b5re4a9tv3vp7k1o17rbe8/gadowulurakodibor.pdfIn PDF document text
- http://baloneacessorios.com/_upload/file///35943871958.pdfIn PDF document text
- http://interiorconsignments.com/media/file/61628449895.pdfIn PDF document text
- https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/60ce3a5761750bef400bdb2f8745a6ee/55643774672.pdfIn PDF document text
- https://area34.info/wp-content/plugins/super-forms/uploads/php/files/lh0hdfha4dkmlvhgp8doo912k1/61467198771.pdfIn PDF document text
- https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/e5k25hchndmsjjc0g7u9a5no04/95661313580.pdfIn PDF document text
- http://dailitara.lt/bites/uploads/file/84276555108.pdfIn PDF document text
- http://fpsh1980.com/clients/7/7d/7de5299bd6bdc19cdd6b275c058e9c4a/File/boxalorixupe.pdfIn PDF document text
- https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/orgjjlspifeoprue24i0rc5ea1/38551795660.pdfIn PDF document text
- http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/nefusazakibarejuzeveki.pdfIn PDF document text
- http://xedaptap.net/userfiles/file/19996958292.pdfIn PDF document text
- http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o587loli8mlajtl7fe1c9cnm32/fonazowukuma.pdfIn PDF document text
- http://erbaytag.com/resimler/files/sufivuxavalojosuwamijemot.pdfIn PDF document text
- http://lideparts.com/userfiles/file/1626097011.pdfIn PDF document text
- http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bf5ade56a---pixege.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=does+social+security+send+1099+formsPDF 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_off0000f3cf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3CF	11192 bytes
SHA-256: `cd51e1ef0646b793e3a847757d19148a1ba429e6acb8fc2cded3d2d6ef413d03`
`font_01_sfnt_off00010e0e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E0E	17780 bytes
SHA-256: `4f6712bfc92731b410e201e831de88fbfb3df297d3b6b1f54e46c078096f505d`
`font_02_sfnt_off00013d01.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13D01	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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