PDF malware analysis — malicious · 5c9f9d3bd62f74e6

MALICIOUS

PDF

88.9 KB Created: 2021-06-25 20:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: a683884bfb7de98a24a0b7bf6623a95a SHA-1: 9ba62404fd18c881cde2e4f775c93489ef71aafb SHA-256: 5c9f9d3bd62f74e650f4635dc668d238b2d1220db7316df5a775d16c2f2d999b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the overall structure indicate a spearphishing attachment attack vector.

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=jacob+blesses+his+12+sons PDF link annotation
- http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/0377bcb5ba02dff98ca3e48ace64c652/kodafanixowopesexuzumaja.pdfIn PDF document text
- http://agendaalzheimer.org/files/galeria/files/jujisidowolexulaf.pdfIn PDF document text
- http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44f0f27436---dozunuzevujuw.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac4d34e3f4---67441059026.pdfIn PDF document text
- https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608559360c07a---83065411914.pdfIn PDF document text
- http://starwindows.ie/ckfinder/userfiles/files/99054081117.pdfIn PDF document text
- https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fe78158ff---15568130239.pdfIn PDF document text
- https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0102753fc---71786886831.pdfIn PDF document text
- https://aftaplan.com/works/peepsparty/html/upload_files/file/dunan.pdfIn PDF document text
- http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60550d64b1---82120537536.pdfIn PDF document text
- https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a92adcfa1---82985089764.pdfIn PDF document text
- https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/1885a2e1002da3de649932b459a2ef18/dowoxagepujenugazax.pdfIn PDF document text
- http://chothuethietbi.info/img/files/1849269777.pdfIn PDF document text
- https://bomberosdenavarra.com/userfiles_nexo/files/1092722973.pdfIn PDF document text
- http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16081d9d12bbf3---46568848119.pdfIn PDF document text
- https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/1508125d3e9c0224abc2b4e0bc4a5134/2498907087.pdfIn PDF document text
- https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/aa8522c9490ec7649d42ef53f9adda7d/gokame.pdfIn PDF document text
- https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/0521bf2aa97c9d0136d514ef9ba84c48/29055463815.pdfIn PDF document text
- http://naturallabs.fr/userfiles/file/zonobebisomufowu.pdfIn PDF document text
- https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e530a446a---53843814448.pdfIn PDF document text
- https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/026657fc34544472558183e1a6da8738/2522498599.pdfIn PDF document text
- http://boxerdapolenta.com/cmsimple/images/file/13368624238.pdfIn PDF document text
- http://st-ark.it/userfiles/files/57136623841.pdfIn PDF document text
- http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ad3247c6f---razinagugi.pdfIn PDF document text
- https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/4135e2cf01f89b0d7d3013a393094d7b/xovozurazunezokuz.pdfIn PDF document text
- https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c395c000962---88108697315.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_off0000fae6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFAE6	10432 bytes
SHA-256: `95f1ab2716802e5e6624f3a003baff7e28fc44df1cb3220cd4a73cd3ce995bde`
`font_01_sfnt_off0001128a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1128A	16828 bytes
SHA-256: `fb0065e04fe61eb0c643544df3bb9dbad6f5efabdaa948979e01fe0ae24fac7d`
`font_02_sfnt_off00013e12.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13E12	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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