PDF malware analysis — malicious · 3f1535905ccc0114

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 15:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 2dfe0725d569ac1e2d8f356e344f7a64 SHA-1: 92ff67e4879392f809e3c0c2b57143fdef327450 SHA-256: 3f1535905ccc01141b0bc61881a74d30a823e900b3276ead3c0c36b5ed463eda

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan. Static analysis revealed numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

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://brahmagnanam.org/fck_uploads/file/36637200523.pdf In PDF document text
- https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/a8k7t3o9g9pd5thachquucttbh/7383013779.pdfIn PDF document text
- http://ylphs.com/ckfinder/userfiles/files/11359204064.pdfIn PDF document text
- https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/mgra41cti0ltmogrjgf0no578e/zaloseguf.pdfIn PDF document text
- https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a62b00d0f---95078462986.pdfIn PDF document text
- https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/ee04d646220de1893c489dc048db9143/39794562388.pdfIn PDF document text
- http://bycongroup.com/UserFiles/file/81152052471.pdfIn PDF document text
- https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b81c3005864---44075878990.pdfIn PDF document text
- http://thepokeluau.com/uploads/files/xubivusazolegoxofale.pdfIn PDF document text
- http://mobydick-band.de/fckdata/file/wupodon.pdfIn PDF document text
- https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/gfo67m9cao9pscj355lak84o11/89187992416.pdfIn PDF document text
- https://estudiowebcolombia.com/ckfinder/userfiles/files/41528127554.pdfIn PDF document text
- https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094f3185b5e2---68613292901.pdfIn PDF document text
- http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160da9b55c89c8---87809421954.pdfIn PDF document text
- https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ba80c81a623c6d2df33cffca27f53d0d/66904875014.pdfIn PDF document text
- https://newtop-eg.com/userfiles/file/79016353929.pdfIn PDF document text
- https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/b4557184c258e7e5f61afb86a369e934/mibixekasiwexamezoduj.pdfIn PDF document text
- http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/3p42tf5jjt4cf43mh7rtg08dp6/91945657730.pdfIn PDF document text
- https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ohjnjt2oqs5j0qvumfus263vai/18359174651.pdfIn PDF document text
- https://gegeny.hu/uploads/file/fuposugizevolud.pdfIn PDF document text
- https://billard-hauri.ch/userfiles/file/83337953300.pdfIn PDF document text
- http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/5rne0cqmuh0o4t2ukt0em6os02/lukawoxaze.pdfIn PDF document text
- http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef903ded3c---kuwisid.pdfIn PDF document text
- http://changwontour.kr/FileData/ckfinder/files/20210613_15C242A3F5D9EC16.pdfIn PDF document text
- https://hohsingfiber.com/ufiles/files/6732457885.pdfIn PDF document text
- https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611220236a584---rajiwukovase.pdfIn PDF document text
- https://anfauglir.com/images/file/99723425124.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=master+the+art+of+storytelling+pdfPDF 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_off0000dd03.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD03	17536 bytes
SHA-256: `52d48c76b3b7f4dae0b21db34aaeefda0de92ae683dd64a760b09a049b06b0b5`
`font_01_sfnt_off00010a77.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A77	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001228e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1228E	10884 bytes
SHA-256: `d39dcaceeb7f8dc81b4d856ebae771e46b70b8a7303c36857b9ccb9128ea3a91`

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