Malicious PDF — malware analysis report

Static analysis result for SHA-256 899c4e0bae489cb7…

MALICIOUS

PDF

90.2 KB Created: 2021-09-05 18:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 75668957d7ba6b7e9ed074414a9b358d SHA-1: da832be1e28071249aeabd32a65ea18cc0f8d088 SHA-256: 899c4e0bae489cb713cd5bbd0e7bc7652794143243923c212442206c8ac4cf24
164 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple links on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://langeline.com/ckeditor/upload/files/34889855600.pdf In PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90beb08ed4---70240126978.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/f4e445f51ff9e7c0ae806f74384c8d16/folenesozazone.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c0eadab57---50386400636.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/safadiwosir.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/16dd4cd5ad9d44b1743799243fcaa9db/sezow.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/zetakovod.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/20455530150.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bdf978c02---pigubiloxoximamogada.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35d442f810---29471840216.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/tuzebivilijoxix.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/ad5bf2580d42d1e80d3d5fc5c8ee2310/bixinaxekosaxibi.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/18589284772.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609919be15f9b---74369988441.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/28637675007.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/86076728359.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210713_194421.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/32a2fe668a9d0e76c12329e669b25b6e/65723927454.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/8820ad07b2f9d10cbd11749bdef1734e/sipodigavaj.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/90072229972.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160841b21bebc1---luzozibemiwavijitizo.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/b01bb4439b127e66821fca30c968d456/50953966424.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/fefigegonaxaxerivobazini.pdfIn PDF document text
    • http://cobmedia.hu/include/75468647625.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/vibikuxepexoviginoti.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/87260403631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=transient+ischaemic+attack+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_off0000fee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE8 10772 bytes
SHA-256: 730ec44adcee4997e03ecf05c4e7744caf03ba5f2e44109794de3bf1be0a79ba
font_01_sfnt_off0001177b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177B 16748 bytes
SHA-256: efd78b3e865c93ab35752382db74d0a92b39f75e57725a34aae23c5312c55158
font_02_sfnt_off000142e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1