Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88dd7e09e6973b6…

MALICIOUS

PDF

72.0 KB Created: 2021-06-26 19:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: efd816e5c7a0cda0e7bde30f2bb834ac SHA-1: b72994516f54498af268c5a7cc949cc052e4f23f SHA-256: f88dd7e09e6973b62977424fdc62574b797116dc64caf8feda7a1c9cdbea7302
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It contains numerous external URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of numerous external links and the overall detection profile strongly suggest an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://philabc.ru/uplcv?utm_term=geometry+similarity+review+worksheet+answers PDF link annotation
    • http://portalcom-b2b.es/img/user///file/_0584938001619768020.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ob1541goststp1aucq0njvbluo/wotabidutizamodasa.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/xuzur.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/37cf28152289f7943694631a72f694a3/porizoriliden.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45f4817853---30430554128.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/803f75ead2805fe7cd6b403a382c492b/44936289796.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606ca06488c4e---49460440170.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c57ebf09577---fikamijipix.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/sao4ga6rkl5ku93pd9dqgr3pv1/bigurikisadokotir.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/73140807568.pdfIn PDF document text
    • http://jarosi.hu/files/file/kerakopuxivinolakefiworif.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/92bd6338e83bdc036c9a9122e8e5005f/vukitezikovuxufogel.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160733913a0e23---popewikojolimuxesun.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/85155240072.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/fe40f707301b8bc59e82960688d5135f/67004416679.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16070815a53eb0---zepusofevuz.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/b70a958a05d83f073c4b3eaf9838ff03/10272628724.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/q4ijkvngim70m4qc1iu7cic9l0/bipexibupegef.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a004065f436---lubowikaxolig.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/11874197329.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99b63f40d9---19189204211.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/352632a881d22273664c155d6e846be6/98876913525.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/jowarorabaxebowizexilu.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a92ed1902f---85693769449.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/008ea02a290ef01cbe59423b6ade3a01/503129456.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/kaxowu.pdfIn PDF document text
    • 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_off0000bbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAB 14960 bytes
SHA-256: 019290e4ef39e34cd4cefb5ce44cc56667c95b39fa700c2be79508ef3cfa8f54
font_01_sfnt_off0000e1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D0 10772 bytes
SHA-256: 577016decf1fcc2b25a5465d494c23392deeee924914a2502ff72a1d81332936

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