Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbec4c5139c9482d…

MALICIOUS

PDF

92.5 KB Created: 2021-09-14 08:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f158ba33b6d3a5b31b1728315f451a80 SHA-1: 8c13c2bb195b72f944a2381e81ff5f238d043ec9 SHA-256: cbec4c5139c9482d91428bb535e291f796553e0ba9adca13f86bc9263ba67f2f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious content. The numerous extracted URLs, many hosted on suspicious domains, reinforce this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://defi128.com/userfiles/files/dejupinigolude.pdf
    • https://jmclimatizacionhvac.cl/images/subidas/file/22537191260.pdf
    • https://webornate.com/viking1/uploads/files/rapefuwupikejazaba.pdf
    • http://duancanhotot.com/upload/files/xorigokezodojufipirekori.pdf
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/kewatefulidonuninerubo.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134269e87f3e---jafubujasavobedenenapefaw.pdf
    • http://elosc.com/upFile/file///ITX202109021358581724.pdf
    • http://ride.hu/images/uploads/files/49751341265.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613498b35e4d9---tuduw.pdf
    • https://kingwaterpure.com/ckfinder/userfiles/files/71037104418.pdf
    • http://oticonshop.com/ckfinder/userfiles/files/36073263091.pdf
    • https://matfplayer.com/calisma2/files/uploads/96284639206.pdf
    • https://wemservice.com/ckfinder/userfiles/files/39805481445.pdf
    • http://ettorebelfioreliutaio.it/userfiles/files/nilotedive.pdf
    • http://fskyok.com/uploadfile/files/duxatejapiwene.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613648363150f---rudiwox.pdf
    • http://bellamy.tw/uploads/files/202109120716224899.pdf
    • http://samocvet.org/foto/ck/files/gatafelafepideximemon.pdf
    • http://www.macrolepidoptera.hu/userfiles/files/55828357009.pdf
    • https://probidjp.com/ckfinder/userfiles/files/20210911_063242.pdf
    • https://sergiomauri.com/images/file/79419665762.pdf
    • http://doradcyprawni.com/images/pliki/bifenipuvi.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613534603423a---8738847463.pdf
    • http://automotiveenergy.cz/userfiles/file/42667203645.pdf
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/86507861954.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=friv+2014+old+games
    • 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_off00010600.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10600 16792 bytes
font_01_sfnt_off00011e17.bin
8202ca7d3f6f15e97e0f51fa9e1e5ef7d9dfc73af11341d87f59cfa0b3ba3779
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E17 10804 bytes
font_02_sfnt_off000136dc.bin
a119c7ed8ed1cfb02a52bf75a23c61d2205a02418a54b8eab468eb17841a2e3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x136DC 17492 bytes