Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b74c45760c30a04…

MALICIOUS

PDF

83.1 KB Created: 2021-07-24 01:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 984ef9016a0e6a0e02d94e2f75d678cd SHA-1: b2cd50a4461769f2f99628dcf83f62a06443ae9b SHA-256: 3b74c45760c30a04379233b596f3a4a78277de5862449ba0420c33c97a65fed1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute further malicious content. The presence of embedded URLs and the heuristic for a 'download button' lure indicate a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://amadpich.com/userfiles/file/vezikisese.pdf In PDF document text
    • http://baraanduliaptti.org/userfiles/file/vemomadulow.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1f8f853ee---59988323298.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/e2903b5a0c5cec5bcb1571227e129c4a/kupebomezot.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/97436808503.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/61920472375.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/sasudoriki.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160872817bff92---17516447165.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d414a87edf---59241585125.pdfIn PDF document text
    • http://savannahcentury.info/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/mutasabubaxebodefak.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160770fcf36e1a---pafimeb.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/18529919652.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/dce4e14678d953256a1ceaba43acdec3/zozewipijozigixu.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/zaxowot.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076189dc2b30---zanap.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c28d2779e06---kedewixosotatew.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/49185962611.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/zudunapanakuvebuxurugixo.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/e1563e3a9ad9df598acb170bfb828951/71068541060.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021071303202773499.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/41235546140.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/xusodogosolepariludasalu.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/81f8c0e27bc919cc1017ddae0c2d899e/sikifivolelaludagemopi.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfbda6d75a8---dofiwatuge.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769ef08e7b0---7969843245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+do+you+do+when+your+ink+absorber+is+fullPDF 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_off0000e035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE035 16680 bytes
SHA-256: 459f20d4ca29bfc85ad5c190e4a50296a7b1b3012d8e368c42023caecbadc099
font_01_sfnt_off00010bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EE 10976 bytes
SHA-256: 33cbd1b14d8573571b85090e5f37ec2410c35761abee29b421c58deeb7e849eb