Malicious PDF — malware analysis report

Static analysis result for SHA-256 613eb8bd56c0cb0d…

MALICIOUS

PDF

83.5 KB Created: 2021-06-24 05:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ef4a2a1d436a3b1fbc82b0b94308a2d8 SHA-1: 94d4ca0d8d3a6367a1a238885da861cab8821d19 SHA-256: 613eb8bd56c0cb0d9a176890ca669b75582463c2c3d52736a87f21c91b7b42ab
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm. The embedded document body text is garbled, but the presence of URLs and the heuristic firings indicate a phishing or malicious content distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://alula.com/wp-content/plugins/super-forms/uploads/php/files/de4d31b71e58ff84543615b480ff7c9e/17761314329.pdf In PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59ad47c03---koxutojabulax.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/73163493580.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/23380324906.pdfIn PDF document text
    • http://soupworld.de/upload/file/vasutizumikapomenoluvebem.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/xorujaji.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/08977cc318d3983097514952b3f5069a/lomabifeworoven.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/74436275057.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/d86936a36260ff8b37640ac15890f7e9/77693312644.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43d1ccfe1c---33262390992.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/lisonanikumezowuri.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b57de5f2b---lovulukafawoxu.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/897cbcd779b7c4c9acd1951fb0922215/51254858783.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021510645186835.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=plus+two+malayalam+previous+question+papers+and+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6C 5484 bytes
SHA-256: f6d054fd8796d2c30b0b4b80ba1365557f695c6dbefa58c3c5412746987a3f3e
font_01_sfnt_off0000ee0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 12524 bytes
SHA-256: b8ecfbf440931eeb59e2e022c8cf96967e89c217addc5589a385941bd4d20cf7
font_02_sfnt_off00011666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11666 11380 bytes
SHA-256: 6e847b50d01fbcaf6c16799838202f758d6bc32e99dd1485e920500f717d44ba