PDF malware analysis — malicious · f326ea713e2c60c9

MALICIOUS

PDF

83.1 KB Created: 2021-08-14 06:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 8d6c465de05434cdf6830ea287635727 SHA-1: 4a6aa4220e90517df105d164d7ce0a2b215d98c8 SHA-256: f326ea713e2c60c9058a29b3596e62e81e6b2c437369d7b6a4a8318ba540f157

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous external URLs, many hosted on compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=current+cdc+guidelines+for+gonorrhea+treatment PDF link annotation
- http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989f10757b5---41415520284.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097ddafdbf04---25955529245.pdfIn PDF document text
- http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16091e0f5dbdd5---58804377894.pdfIn PDF document text
- https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/fd7ae5e03d41621ccd33e4bbf3085ffb/79002858449.pdfIn PDF document text
- https://lienlacanien.com/img_pages/file/27974576405.pdfIn PDF document text
- https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/0fbabe41f8ca6d6f4695473231d20d03/vegojalile.pdfIn PDF document text
- https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/3acb460868a2781cf5745dd24a1c0f35/5176293864.pdfIn PDF document text
- https://www.jnvhardoi.org/ckfinder/userfiles/files/44940050772.pdfIn PDF document text
- https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bf84447cd0a---23747609900.pdfIn PDF document text
- http://fteq.ru/files/file/66590884843.pdfIn PDF document text
- https://mujeresenmovimientoplus.com/userfiles/file/kuvavunokobarulu.pdfIn PDF document text
- https://weeb.nu/userfiles/file/jivom.pdfIn PDF document text
- http://workcoop.org/fckeditor/userimages/file/20210601062633.pdfIn PDF document text
- https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/242aae558d972bbdbbcc357e92b3a2ac/sevogumalapiterezexo.pdfIn PDF document text
- https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/dbc743a3793585851f43bdadfbc38acf/gevoxefekuxedogepede.pdfIn PDF document text
- https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ldqp0ulqdvrt6tboe1pdbsuut1/40198701988.pdfIn PDF document text
- http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46fbc8e597---91125487676.pdfIn PDF document text
- https://fontaine-eva.fr/userfiles/files/34041577603.pdfIn PDF document text
- http://axiomestates.com/userfiles/file/57162746741.pdfIn PDF document text
- https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56b9a4cd8a---74601825622.pdfIn PDF document text
- https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/bfebe9e1619b994a812edfee68f85cf4/sorenufavabuxodaxis.pdfIn PDF document text
- https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/3016olgc4kaa844oclikq1ohe1/zajaluxokoribuk.pdfIn PDF document text
- http://thamdinhgiadaiquang.com/img/files/32309205576.pdfIn PDF document text
- http://traviet36.com/upload/files/nogikefevikizowi.pdfIn PDF document text
- http://sanarina.de/ckfinder/userfiles/files/rukamene.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_off0000de90.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE90	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f6a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6A2	17172 bytes
SHA-256: `eef119761021608b56dcc7a7d9c5336b831f56f6f5c65f6d7af6c6f8aa3d3a6d`
`font_02_sfnt_off00012312.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12312	11052 bytes
SHA-256: `f4b6f1b42eefd059b3c7b0289c7e67cfbc4f74891378d931246b76478fff5881`

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