PDF malware analysis — malicious · 31d57e9692d59a9e

MALICIOUS

PDF

74.4 KB Created: 2021-08-29 15:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 6bc1e6969b1b327de40f6d3e268f8143 SHA-1: fa835eac95fd6f5bf8268d90bb77eb2b8c5f2980 SHA-256: 31d57e9692d59a9e9adff213e1ab14bf2348fa3a9d785547c13b1610dd3e1665

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous URLs pointing to compromised websites and disposable hosting, likely to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns suggest an attempt to lure users to external malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9934

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://www.bussmann-tiefbau.de/ckfinder/userfiles/files/wumitakidapotod.pdf In PDF document text
- https://decoveinvestment.com/userfiles/file/nakeroveru.pdfIn PDF document text
- https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/37d335868df16e534c86e39d0e65f4a2/40053714335.pdfIn PDF document text
- http://luxmeterthai.com/ckfinder/userfiles/files/22456172194.pdfIn PDF document text
- https://parokisantolukas.org/Uploads/userfiles/files/90829531634.pdfIn PDF document text
- https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/b6541f209111b5ee020ee445a4a6f483/pebodobodaxokasu.pdfIn PDF document text
- http://chinalabware.es/d/files/radegudenonipus.pdfIn PDF document text
- https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/0vapffe5opgkf288r53gakka3u/71958746776.pdfIn PDF document text
- http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9fdb6d025---30624508637.pdfIn PDF document text
- https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3a177bc66---70571231778.pdfIn PDF document text
- https://kirmatas.com/userfiles/file/serovopibodigodepasaba.pdfIn PDF document text
- http://vpecargo.com/userfiles/file/69635292852.pdfIn PDF document text
- http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/9ii8bo0hm8c902tsaafcf4kv27/wuxobireluxuridefetab.pdfIn PDF document text
- http://emilygrilltogo.com/uploads/files/8145143416.pdfIn PDF document text
- http://fpole.ru/sadm_files/31922713856.pdfIn PDF document text
- http://industrialsupplies.pk/userfiles/files/63028994262.pdfIn PDF document text
- http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ec35e6354---48336979084.pdfIn PDF document text
- http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf9324798---zuzexodofe.pdfIn PDF document text
- http://hugslock.com/app/webroot/img/files/vafipomonunozifazevola.pdfIn PDF document text
- https://tortugafilms.ca/adminfiles/file/63965297953.pdfIn PDF document text
- http://mhinflatable.com/upload/file/99544317047.pdfIn PDF document text
- http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608762f169383---dukatopinusogelipiwepepa.pdfIn PDF document text
- http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16084ef9acba07---82599392788.pdfIn PDF document text
- http://patrick-vallot.com/upload/files/40945808973.pdfIn PDF document text
- https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/523dcecd4478f4f7124c60ce580b9ded/sinalewixubudekade.pdfIn PDF document text
- http://iwilldoit.ru/uploads/files/files/54546257802.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=dry+mouth+causes+bad+breathPDF 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_off0000c3ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC3CA	15136 bytes
SHA-256: `484cd0e633dffaef7f5984e225b6965182363cae03f8fc5459456a471d74e233`
`font_01_sfnt_off0000e9fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9FA	10748 bytes
SHA-256: `72771d2c75e8a82bf860f16da71670ac1e8a13afd453226c12d882e9be9dcf65`
`font_02_sfnt_off000102cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102CD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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