Malicious PDF — malware analysis report

Static analysis result for SHA-256 49c100f029b719ef…

MALICIOUS

PDF

73.8 KB Created: 2021-06-27 00:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5cf83f73f8f586ba69f02d66019331f3 SHA-1: 958edc020ed9295eb1b48a708bc7d161c196d60e SHA-256: 49c100f029b719eff8eea88687ba56158bac97027b5cebd0b46b3541021edb92
156 Risk Score

Malware Insights

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

The sample is identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external resources, some of which are hosted on compromised CMS upload storage. The primary attack pattern involves luring users to click on these links, potentially leading to further compromise or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cea127867c8---80238278071.pdf
    • http://tea-ra.com/user_data/upload/save_image/files/8517873540.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/1d947d983087276bf7dd60a53d0e5e1a/mowuvul.pdf
    • http://mosvag.ru/img/lib/file/kojorujid.pdf
    • https://aonetreks.com/uploads/file/fudiboludizit.pdf
    • https://laser123.com/geektic/files/rawagupiwaneximuxazalode.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa519d43591---36845038984.pdf
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/mitipazeda.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160863dd908482---lerafawirokosabizaziwi.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607280376b740---bilejawukukinonirozupowes.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/4d6948cd73e1161bd38421b5a9eab32c/89237847019.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/uivg7p4ogh1pmsei1d6m1356bm/zofotipepejegek.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/1c5e31d12be5f1332965c2e7926d93e1/76837335028.pdf
    • http://icsbc.ru/fuploader//file/49568001231.pdf
    • https://numberonerevolution.it/file/78169461141.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ab5a44bf06c67922f6bb9d8b3460b1d9/degegatobadozelekufafad.pdf
    • http://bygreenpure.com/userfiles/file/38876236342.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1473e1735---34058857428.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817e0fbf7ee---nigekekuwabuzogepubegoji.pdf
    • http://ceskylakros.cz/userfiles/file/82373097314.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849ccf8f2ad---3314225869.pdf
    • http://enjoybowlramenandpoke.com/uploads/files/60632499555.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607349343cd5f---ripidezezekade.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=neither+and+either+meaning
    • 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_off0000c00b.bin
22180e08e8943c05e2f91388b9d8fd1f354de6a90bfe29cc50e780ac4882abc4
pdf-font-stream PDF embedded font (sfnt) at offset 0xC00B 10336 bytes
font_01_sfnt_off0000d6e5.bin
676e665c9df3c3046808dae106dc1aa8b9a07d17ad93cefdc3990eb13db26433
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E5 17236 bytes
font_02_sfnt_off00010203.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10203 16792 bytes