Malicious PDF — malware analysis report

Static analysis result for SHA-256 f94f4301a2da685d…

MALICIOUS

PDF

80.6 KB Created: 2021-07-16 09:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38708941db22548863c915555ed09c28 SHA-1: 3729e5de9e071075ab99f46dedb9fb068e7ad96e SHA-256: f94f4301a2da685d832ecfd31d812b5788752993b99e94219c8a5b17651b4ef7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary function appears to be directing users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5f5d49ad28880ea9f91b8836ec72e9fc/69811274323.pdf
    • http://termitecontrolservicebd.com/ck/upload/files/xadosapal.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc873d03f1---56537136524.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a04c9998392---60780512905.pdf
    • https://torgradio.ru/new/files/file/monaselutuzo.pdf
    • http://bagiez.com/userfiles/file/panibesomolajuwazewiri.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/7c9d2df270920ef5bb7dbe76225a9f3c/siwidobit.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160de187beccc9---31497426360.pdf
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/63979718864.pdf
    • https://luathoanghuy.com/uploads/files/tukapira.pdf
    • https://icon-studios.com/userfiles/file/zeduzimotelokaropamog.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735c8500bef---daguwofif.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160965d2e1bbab---nodevafubuwufasafor.pdf
    • http://espacioschillout.es/images/admin/file/zeferomafabel.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb27f03911---36106331158.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/557661e441df855274168316e1e23b5a/62291881245.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/017314592341cf222bea0167e37b1b29/zugebuzubefiwusobitogof.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/2444948b519953655f7e04f96f947554/67957836873.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a60c4cda5---sapelixulemarevufibiga.pdf
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/60538457324.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608110444d736---73108044063.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/e6df256abf35813410fbc0291a44212a/56092304290.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f11f5a95af2---54817738852.pdf
    • http://aihyang.com/userfiles/file/kemogumurogobaloxuf.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e00d62746---39411616269.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5daa8a1b0---todarakexufepi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=have+you+ever+fallen+in+love
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d70d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD70D 16792 bytes
font_01_sfnt_off0000ef24.bin
6072b340c3fa45492b0f7f8baff2b7685d3f99a8aa3e277a60c6232f919e9c61
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF24 10212 bytes
font_02_sfnt_off00010616.bin
395feb0593ce0b078c55abe9afa7364882e96bef8770c52269dc76922acd080a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10616 18196 bytes