Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a710eab35667b5…

MALICIOUS

PDF

81.1 KB Created: 2021-09-28 22:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 67d7bf07a02ea5e3770e08d4c135d0c0 SHA-1: 8216c82b68ecbbfbee999d34ac29a38aeb04d085 SHA-256: d3a710eab35667b5d8dbdb24cf97522d4991a512ccaea8a4ef015aaad8f47c27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristics and URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/f6a75ddd16c9628dfe333bb615fe2ece/dasoruzujobam.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb2f403180---niximegevelovenet.pdfIn PDF document text
    • https://luminex.pl/upload/file/66321607183.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/18692267237.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/tujoxebobifofewelegumu.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/bowowutow.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/87480649122.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/bemalunipemijekis.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210902184522.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/retaferudokewaxadofabaw.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615129df19b75---tabusofomuzatifowopetup.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/puzawadedaluxezoweju.pdfIn PDF document text
    • http://bulmarconsult.com/files/98282061175.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/rabaviwemij.pdfIn PDF document text
    • http://kalbaninc.com/userfiles/file/foxotet.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/34830935285.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/wigipirimetupifizojarulav.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/wofilebuzaxakedejibivu.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/87450232209.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/33541148725.pdfIn PDF document text
    • http://jinyudachem.com/upload/files/99240523227.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/27819669920.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/i56q8cvpl4fgehmjf4ifdnp3ht/gupanubevukujolomevina.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/76797359948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=sniper+3d+shooter+mod+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C5 10948 bytes
SHA-256: 0009a5ed57a4eb6dde116b4731663d7c2b32c1eca186a0971382896663542a68
font_01_sfnt_off0000d2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F8 20508 bytes
SHA-256: a36965f98e5bccccef387441e5d8d4779580da69c5068d9b84934827e66f45af
font_02_sfnt_off00010826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12037 16188 bytes
SHA-256: 800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34

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