Malicious PDF — malware analysis report

Static analysis result for SHA-256 892ae66ac6e2622f…

MALICIOUS

PDF

88.9 KB Created: 2021-07-02 15:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c06df2a35f8e233c229b3030e22a609 SHA-1: 41e904b905d8d6a340b106debd5f745403d2105d SHA-256: 892ae66ac6e2622f96d525d2c50ea4990cf31919335f2af641f9cbb66bf8ac19
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The primary purpose appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://inwebjor.ru/uplcv?utm_term=400000+crc+to+usd
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9f1fdfd09---sagoxem.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083752030e2f---tuzagumelumoxatubowiparo.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/3ff5cba652295394eb458721a5b09ea2/xibironexadu.pdf
    • http://goldenteriyaki.com/uploads/files/1417857691.pdf
    • http://self119.net/upload/userfiles/2021/06/files/210618034334.pdf
    • https://panificiopasticceriabattaglia.it/file/xazidunizigo.pdf
    • http://asiavent.com/UserFiles/file///berunanezabe.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/pram116t5f4n581mimv10kuf1l/97259733996.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077bf037f386---64275605708.pdf
    • https://sunarchegypt.com/userfiles/file/63242148869.pdf
    • https://majubesar.org/contents//files/78724562647.pdf
    • https://lescourailleurs.com/upload/editor/file/95384489278.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1dbca6d88---34231915294.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607493278a874---33897976298.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/6b58c28d6422b735c72e5351dcf13879/5898764619.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/dljo8cnjlh7adecas5ueuv6j74/17041320753.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/k34gtlhbe9029ak33m128cju10/74146319455.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d699a68957---70684548383.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de71d05af5---839005861.pdf
    • https://clumba-indoor.ru/files/files/woputikakot.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/4dd1557ae52382fe4527b8190c2e79ab/gagomozitodadolago.pdf
    • http://edelstahl-berlin.de/media/file/98585974885.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852d58cc321---30025583201.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/8ta16lsucu6gfuu7fu36te91pu/32643399163.pdf
    • https://espaciocultivarte.com/ckfinder/userfiles/files/84384496662.pdf
    • https://tidaksusah.com/contents//files/19411943360.pdf
    • 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.

FilenameKindSourceSize
font_00_sfnt_off0000e3cb.bin
b9d6ec7840064b836544b9f586adbc61bbf1f9bc7a0de4ffb49e49b79e631929
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CB 10028 bytes
font_01_sfnt_off0000fa36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA36 16792 bytes
font_02_sfnt_off00011247.bin
5dc452f2b4f8f6cf50bab96a09d9f243b03113461a4839846761b06a93380fa3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11247 16224 bytes
font_03_sfnt_off0001281e.bin
7f15baf513e83797a4eefd7237665e81ef00d7fc76a53d46bf5bf82ca0f1b41f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1281E 17772 bytes