Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38b475c3b645193…

MALICIOUS

PDF

76.4 KB Created: 2021-08-26 05:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 05e12dc6d85b73b8529958f0819beb6f SHA-1: cf1a1a3ad25fa0f50d6eb88a810dd461dc95198d SHA-256: f38b475c3b64519327111d5231f95b5f4146c26f85b33e2e726cea2d6af59797
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to external, potentially malicious websites through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://inwebjor.ru/uplcv?utm_term=shriek+if+you+know+what+i+did+last+friday+the+thirteenth+full+movie PDF link annotation
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/136d8da9f7ab1f5791170894e1cb536c/26023972864.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/watepudawuviruzu.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/84088890607.pdfIn PDF document text
    • https://projetovm.com/uploads/files/96759645696.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/61654723006.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/62433725075.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160af773367675---viwerelexokeligakizupexad.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/muwebefelakuxofofetamus.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/61989791353.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608744b9707b9---50458638805.pdfIn PDF document text
    • https://hsse.cl/files/90439103087.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/a0e62a3bcce8b0c42e88fbc23c304681/71435029312.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607718b247dc2---gogedakojun.pdfIn PDF document text
    • https://sce.tw/uploads/files/60b57c3a35979.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f0599f455---86802059629.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/gumewe.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/0b379179d1cec37168ef6b19ef812935/kigadonanufelawosubidok.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/60133931357.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/73418084688.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ea5c326697b4ea30a2d372ceed64a6b7/valepumusadajodikotok.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083059c489a7---zimifasixetekubigokikavu.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/tirunugapov.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/1478564377.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/92347670727.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2954517403437c97b0915911df04aa0b/gulunibevelaluluvulawaza.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/8cf76884a2296a2481e2d077f5942707/zivujemawewarajebunewo.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_off0000c3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C3 11152 bytes
SHA-256: d806f1acd4a39ad090d273c78b138b9956283af0f7aa9a709736f04b7acc8da4
font_01_sfnt_off0000ddb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CB 17620 bytes
SHA-256: cf508336f53a19f00bff9f2766896469c91b8da869193ba6041d35cebace9549

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