Malicious PDF — malware analysis report

Static analysis result for SHA-256 b486652041b4ea5c…

MALICIOUS

PDF

115.6 KB Created: 2021-10-08 05:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: af58e80ccac37e0f733c82c9f4c5f580 SHA-1: 548c3a04da2afbeb792a9ec0000ed16f2ceeee8e SHA-256: b486652041b4ea5c0ea34c0f4f73dc962c87e0bc3b53346a1503da535e5c4f53
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615f987e36cfb---57287652180.pdf In PDF document text
    • https://tectrongim.com/uploads/files/61151009438.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/kivesomupinozadupafuj.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/zosadokezapagavojazo.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b2fc1441b1---zolus.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/93661465119.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/43484603699.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/cecab16cd99fd7b3d289fae7c49119cc/76619976576.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/giruw.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614017d972dcc---puzunowepize.pdfIn PDF document text
    • https://papiratisk.cz/soubory/wawexudanugabetin.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/37007041735.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/36929816720.pdfIn PDF document text
    • http://gzxmbx.com/uploadfile/file/2021092010130573499.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/gusugemotomokoribiweza.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/fibenejodifomepoloj.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/povoferesiset.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/jirudidi.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/paxuxivotukiraruwosubu.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/xudorovapiveguremisijog.pdfIn PDF document text
    • https://avukatwebsitesi.cicasoft.com/upload/files/wizasegiduxatekozatexeb.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/31888936055.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/zoridumipemidukutasug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ant+man+and+the+wasp+mcu+timelinePDF 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_off0001591e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1591E 21184 bytes
SHA-256: 50cb30d907d496d0b022d1abc960589a5ea7d9e4de30aae6cbcc1ed450c903dd
font_01_sfnt_off00019036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A84D 10724 bytes
SHA-256: 33030729934ecc72c40669eae2ec8f4a2af87b5d8a59964f57198dbd444ab435

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