PDF malware analysis — malicious · ef743ce50aa9cb6e

MALICIOUS

PDF

99.3 KB Created: 2021-06-28 02:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)

MD5: 2b3dee2d3e83bd66a63d94ff8624c918 SHA-1: 195a150487726e2acd86f24c84020e0b2e240c6b SHA-256: ef743ce50aa9cb6e7b39ff543c44d827c89422f7c6bc0f22aeeb2bd7182e8ec5

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly indicated maliciousness, and the structure aligns with SEO spam or phishing lures.

Machine Learning

Nyx PDF Classifier malicious score 0.9898

Heuristics 5

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 http://rsst77.ru/upload/files/gutimituvegiba.pdf
- https://gomaihoa.net/upload/files/90760637456.pdf
- http://travelshops.pl/userfiles/file/filegagumido.pdf
- https://arerp.kr/data/file///banalugebodaberem.pdf
- http://szao-spb.ru/images/news/file/nowovirago.pdf
- https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/59fe167980c1ada8506445de2b3fbb93/40354381802.pdf
- https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/cdd5ce78a87fa7d3197b2280c2b52b8b/25365589153.pdf
- https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2637be563f---dadaduxugu.pdf
- https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/efb73fe5a3c02a9418a4572c84c79f18/wozuxumixutupejuzojupuwij.pdf
- http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/sqbve1oc29rcbj9dlsdq52a204/15740359940.pdf
- http://derkwoo.com/upload/editor/files/jodoja.pdf
- https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/5dpbg1qg9vumcgifm03c00j01o/lokaxenidilabu.pdf
- http://www.lugashotel.com/data/editorfile/dituxem.pdf
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a965fd1650.pdf
- http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/46475512949.pdf
- http://alimentosldm.com/userfiles/file/7464617541.pdf
- http://3suntech.com/UploadFile/file/20210614102152344.pdf
- https://stvorki.ru/files/file/27138202009.pdf
- https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/9aibqpv4kn7u0le6n1ubnlkiek/tadaxadanaluzaluwiwiloru.pdf
- http://acril.ru/ufiles/files/gexipetujilez.pdf
- http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ff0cf3928---nowifawe.pdf
- https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2718097b3---fapibowevenaluwepax.pdf
- http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d419653acb---libiwomogix.pdf
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pac+man+championship+edition+dx+trophy+guide
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/
- http://dejavu.sourceforge.net
- http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0001105d.bin` `27ded5ec5edfc0660e2e208e1cac5f9008d2fd222abc2ce30bcd39f9c6de0a20`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1105D	2360 bytes
`font_01_sfnt_off00011ae3.bin` `c948eee6b07ce4c4dc5db64d53bd0e380bfe1c95a7c4adbb4efe0475bf6adf32`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11AE3	18336 bytes
`font_02_sfnt_off00014b67.bin` `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14B67	16792 bytes
`font_03_sfnt_off0001637e.bin` `87be0450be15d75e19849acc206f67cafdba2c82866ccefcf3305586a3e2fa8b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1637E	11232 bytes

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