Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff2a534d9c3be07…

MALICIOUS

PDF

70.2 KB Created: 2021-09-05 20:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8de7cde7499042600f038de3e9d49145 SHA-1: 290865766700e344e4e9a1bfb1d0440f0cc96a99 SHA-256: 9ff2a534d9c3be072c9483daaf7ecef888c16a712afea9a187940c776b33b4da
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting an attempt to redirect users to malicious content or download further payloads. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, reinforcing the idea that its primary function is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109cf31f09a6---71530912812.pdf In PDF document text
    • https://landtop.com/filespath/files/20210818080133.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccc8fe5127---78288514441.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16125e9f138e19---2222677213.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611fef211256c---45802734007.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/50752480205.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/muvogifemorekumerad.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd5a794045---13065611019.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/87190444484.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//26149594561.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/satoboponisavevejopamal.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1cb49a2043173dd74d94e3b4c608bd09/15434777837.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8a655b3b3---18573028230.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/24561571601.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609405b3b49d3---tebabasegubaziwesuko.pdfIn PDF document text
    • https://led7.ru/file/nasezebozazijubexub.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/dewoxapujixapixat.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074c740d3030---wavinidigezigitibowawu.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/pokuzufobaw.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/jipeworulogegefefori.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/56584894547.pdfIn PDF document text
    • http://agro-partner.com/Image/files/57720640466.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/51498710453.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/delawiseni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=tally+erp+9+notes+basic+accounting+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_off0000b410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB410 14172 bytes
SHA-256: 72200c6705864d3874837ae728248f86b5729119d063e230cc550a9836282b39
font_01_sfnt_off0000d702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF19 11280 bytes
SHA-256: eb0a1e1e4e5057c99c888bcefe0d29564ecfc68e5c2c4b7922f35ef3ae85a8f8