PDF malware analysis — malicious · 6f451c8d8cda7f28

MALICIOUS

PDF

89.7 KB Created: 2021-07-14 04:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 1e0062c1f618044976603c847d8d5089 SHA-1: bc57de13c0a082c39520a6448f2081320c24512d SHA-256: 6f451c8d8cda7f2854c17d04bdf70a9b012ed84885694797536f70b9d6f15df6

104 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier strongly indicated maliciousness, and the presence of numerous unknown URLs further supports this. While no scripts were directly extracted, the structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 6

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d69ca46ac9c---8228716219.pdf In PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b766d423ca5---63860319938.pdfIn PDF document text
- https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1d735872d---sodulaliwa.pdfIn PDF document text
- https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/a8e01ae919fd20b09a8d959c32ad0069/pofepa.pdfIn PDF document text
- http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/82926450283.pdfIn PDF document text
- http://wojno-stal.pl/pliki/file/54125945159.pdfIn PDF document text
- https://ppuhperspektywa.pl/files/edytor/file/5351312207.pdfIn PDF document text
- http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ee7b0237a---12836373927.pdfIn PDF document text
- http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed6edd2f9c---9690280086.pdfIn PDF document text
- https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/uikk27m2fgb3rdmnfjfqfrd0ha/tuwurawonufisuxilalawo.pdfIn PDF document text
- http://jcon-aps.dk/userfiles/file/8217096107.pdfIn PDF document text
- http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1ab326adb---movajelumufijevu.pdfIn PDF document text
- http://ahlhy.com/uploads/file/272302442891.pdfIn PDF document text
- https://mut-zur-veraenderung-hambuch.de/userfiles/file/kulifotukemudezosetofekog.pdfIn PDF document text
- http://zgkimsteszew.pl/img/upload/files/mawagaliseludajakuj.pdfIn PDF document text
- http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe38976c7d---52838245637.pdfIn PDF document text
- http://canxetaianhduc.com/images/file/jusafiw.pdfIn PDF document text
- http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/riputifigavutanu.pdfIn PDF document text
- https://ketdoanbus.com/webroot/img/files/gorareguwodisipasozevowu.pdfIn PDF document text
- https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/34dabbc65b6636bcb19262fb85cb98bb/96549039369.pdfIn PDF document text
- https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7936c0e3d7b9c54fe5ea9755c38b522/91700906848.pdfIn PDF document text
- https://strechybenesov.cz/content/90676402767.pdfIn PDF document text
- https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f689cc9a01---bofapazof.pdfIn PDF document text
- https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/28ba3bfa5517a35fa34c2b07ebf00476/15802734188.pdfIn PDF document text
- https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d5d0a0513ac7919b9c08189faef761f9/37802397801.pdfIn PDF document text
- https://cplastik.cz/data/cms/file/80020331547.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+little+red+book+of+selling+pdf+downloadPDF 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_off0000faff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFAFF	11060 bytes
SHA-256: `20d11588a5428d12dc9bf97a8ec5a49bdf0210fd96d8b5a6dff6203d394eb95e`
`font_01_sfnt_off00011450.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11450	17228 bytes
SHA-256: `550ab5d62840253e26af918ea392d1134195ec3a09adca66dc001a05d97f4999`
`font_02_sfnt_off0001410a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1410A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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