Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96c5aea87f557fe…

MALICIOUS

PDF

95.0 KB Created: 2021-09-07 03:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 696859b02b3f3be8695baaea804711a1 SHA-1: eb00fd30bf6793c7ac0535657f5c0f76495e7f46 SHA-256: a96c5aea87f557fe666c361826aadc4767cd2ad47d27c1923960627ba1fdf828
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, 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 sites. The embedded URLs, such as http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de9ffe596c---68620277261.pdf, are key indicators of this redirection behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://taiyoaquris.cn/upload/userfiles/files/20210714091724.pdf In PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/8135267bb143931c62083b67775f62c1/nonezuwupipebezerolilelu.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66acceea85---gefonuvirodibewufejivin.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be70669225---kapunoxolefegib.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/tesukujonoliwa.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de9ffe596c---68620277261.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c855bf734fe---89485407108.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa939dbea2---70165952661.pdfIn PDF document text
    • http://pbsdeltarho50events.org/clients/d/dc/dc3fcb918f61c9276c5829b035df2abc/File/ravamupigidiguzo.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/puzafisowofuxiwirodige.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/c39549f4ce59b39f892b87bbb0b0ee2f/99657441262.pdfIn PDF document text
    • http://julianina.dk/upload/file/wufidivikeguma.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce3fa10c98---11580226185.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/90044853254.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/pasuroruxomokelekoj.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/difulewu.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c3675cd66---sirurivarigerukabojeka.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/71746111209.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/763c32c141c7402a0c19c5df09c41af3/kolijaxukudelemerolofa.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/zulev.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/13848346925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mp+assembly+election+2018+bjp+candidate+list+pdfPDF 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_off00010b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3B 17464 bytes
SHA-256: fd9a380a86c8e09b7be2dfcea927f6ac2acb9a6492640eea49f745c3fb1dc401
font_01_sfnt_off000138b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D0 11560 bytes
SHA-256: 5a2233640bc6baf8a3c8c4adf4c2c92a25b5fbafc52947fc55a65b1732b0ba0f

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