Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb0ed433e3a1b50…

MALICIOUS

PDF

87.8 KB Created: 2021-06-27 06:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 415457903c082461bcc532dc5c8082c2 SHA-1: 4194e3b3e3965174feb65e86de5315ed56337acf SHA-256: 2bb0ed433e3a1b50edebe3ef61a645820889f27de2d0dd64ee7778092624bdee
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://allytemp.ru/uplcv?utm_term=myalgia+causes+and+treatment
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3f049662d---xosadasumilo.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b209f1680---78083642468.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da2fcbe4b3---36570431380.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/e0f3fa4bb0969edb4cf1c5511931081a/13411036554.pdf
    • https://andrejc.si/files/file/letekugeki.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/40ohcn0t7q0dkeb1k3507b22s4/99618755897.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160948d54a38af---bilisugodenogolano.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608333117d671---58798099055.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073318eb3c34---76121469424.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16095f9060fc2f---rabotatis.pdf
    • http://parvazyab.net/basefile/api203/files/32697684936.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52685d70fc---nenigusaluponupiw.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/jcobg606v5te9burv4stl7hfm3/tujuf.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/59df5ab1745419809367e63c339ddaef/49815839129.pdf
    • http://frangarcia.eu/upload/file/dupujepomijulaje.pdf
    • http://anhuifan.com/upload_fck/file/2021-6-22/20210622144613693753.pdf
    • https://harkakotony.hu/UserFiles/file/77585113198.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dfc451be7---23960702894.pdf
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44060660336.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609096e60124e---pabexufare.pdf
    • http://www.urbanwaterways.info/files/47459758604.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/b7a74022ff16f33abb37c6fc5795727b/32682664152.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4c5.bin
0d3e2f52d5ce5110556577d5390723b36a6ae1472d5be4e58c8ed2cd2fc7e639
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 17116 bytes
font_01_sfnt_off00012181.bin
cc29da4f82513432203290f349ec02c618ef9354c4e52e0a41bcdb100fc0f503
pdf-font-stream PDF embedded font (sfnt) at offset 0x12181 10800 bytes
font_02_sfnt_off00013a32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A32 16792 bytes