PDF malware analysis — malicious · b95996b0912d5688

MALICIOUS

PDF

90.4 KB Created: 2021-09-07 08:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 5cca2c9af72797cca3217d8f1586b933 SHA-1: 256a100e6c264b9a7f9ae702d80f9620d92fab9d SHA-256: b95996b0912d5688847a0c33262b2041bcbd7dd16a45771cdf228245221a706c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attack pattern focused on redirecting users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9913

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://drafthe.ru/uplcv?utm_term=how+to+calculate+power+of+pump+pdf PDF link annotation
- https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d009e889a6---kobox.pdfIn PDF document text
- http://meta-min.com/files/54911680556.pdfIn PDF document text
- https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089907e88382---23737961090.pdfIn PDF document text
- https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/e252065e7bccee51861b1dca8c205e07/21149937601.pdfIn PDF document text
- https://www.mmgrowersg.com/ckfinder/userfiles/files/82090171777.pdfIn PDF document text
- http://ildungrice.com/fileupload/fckeditor/file/41927306470.pdfIn PDF document text
- https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7ebb47103---xukifisef.pdfIn PDF document text
- https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/j2fi04ojgahmlt8g6a3as5aed1/vewadutezena.pdfIn PDF document text
- http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c486f948ffe---72093504424.pdfIn PDF document text
- http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/xojakixenenonuwosunedili.pdfIn PDF document text
- http://reicar.dk/userfiles/file/redisusekiwo.pdfIn PDF document text
- http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/740d0a29c0111b819cc762785da94c97/korifenakokowudapoz.pdfIn PDF document text
- http://villaelen.it/userfiles/files/31652902071.pdfIn PDF document text
- http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/8699d87faf4085adfe3c7e111eea14f0/samadojijugorib.pdfIn PDF document text
- https://equantumconsulting.com/files/files/60721731123.pdfIn PDF document text
- https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/05f258f9562db24e63b35042cfc21b82/69142694976.pdfIn PDF document text
- https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d5d0a0513ac7919b9c08189faef761f9/37802397801.pdfIn PDF document text
- http://goopenapp.com/uploads/files/gejuwutigujulag.pdfIn PDF document text
- http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16071c7822e34a---33585995317.pdfIn PDF document text
- http://golden-candies.ru/webroot/files/files/daxoginadidiz.pdfIn PDF document text
- https://okinawa4d.com/contents/files/zopatunugab.pdfIn PDF document text
- http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43178c84d4---70034140086.pdfIn PDF document text
- http://oresteruggiero.com/userfiles/files/dotiwemakexadudatas.pdfIn PDF document text
- https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb88fcc89a---bidilususozenawuluk.pdfIn PDF document text
- http://phanphoiongnhuahoasen.vn/upload/files/wizej.pdfIn PDF document text
- https://ipic.vn/userfiles/file/dizewobepimidisovonaka.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_off0000faf5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFAF5	18624 bytes
SHA-256: `a60377fa1dd64a2c7f9049bce2cc27afcadfb507b7dcd823c33c954a3d215a31`
`font_01_sfnt_off00012b50.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B50	10596 bytes
SHA-256: `f425f5d1d5c3120e62ee2c153025278aede8ce6005bf815290aab77bc796d1f8`
`font_02_sfnt_off0001439a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1439A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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