Malicious PDF — malware analysis report

Static analysis result for SHA-256 3530a35d4cdfb0e9…

MALICIOUS

PDF

95.7 KB Created: 2021-09-04 13:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e24034cbed1fbb5ecb4b4596aa83e0b1 SHA-1: d4a51f412628b8fe807284de68c03447c0ca206b SHA-256: 3530a35d4cdfb0e94fdb57f74fafff325d4a06b4d6afa71442ceda189f271434
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware lure. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to deceive the user into taking an action, such as making a payment or downloading a file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://fullprotec.com/ckfinder/userfiles/files/4990214837.pdf In PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b193f03274---wesotimitokipufelepogek.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/6858175042.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/nejorodolezawibemafama.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cafa820a90---13486715295.pdfPDF link annotation
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dgfot8tk5fhvcdauh78cmg6ea3/55059540536.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ba9776934---makipozufiravomokologa.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/i639am87m8a2i2ug5331b3ig4g/81419865078.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/34549368694.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/5823140647.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611a3519b7f83---xofasitojikonal.pdfIn PDF document text
    • https://drlanda.hu/user/file/dozabawaxad.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a34cd853cca---vonotuzujalegipiwotis.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/071dj6brvcbqpr27194i19pa5j/15754568212.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/sevulopi.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/41702341276.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-06-22/images/files/1187601467.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/sebefenoseweziwupabanel.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/61309866525.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0bb5a7b2a6d3bf767947895e9d8eaef6/60425428168.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/hj0ltjha8ujv5jrgg70l0t5g5h/5420422481.pdfIn PDF document text
    • http://gibisch.biz/files/files/15706279029.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/3dda1694129d2eaf820ab2fc6ab54356/74277666345.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/maviguduvopagoziviviti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=generate+pdf+from+html+itextsharp+c%23PDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8F 11024 bytes
SHA-256: f8b61e12e1806c11c3fc8c5ca67e9a384b8fa1d25bf208d0bb73babc362387a3
font_01_sfnt_off00012805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12805 18404 bytes
SHA-256: 02378a309c21ed5c855b3ce6abd2399f4ea59ec98ea2235186e97db091a540f1
font_02_sfnt_off0001590a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1590A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1