Malicious PDF — malware analysis report

Static analysis result for SHA-256 b749c2e38929a82c…

MALICIOUS

PDF

90.7 KB Created: 2021-07-12 17:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 298f4c346979c6abf297a81893a70481 SHA-1: 72c826481b496b85fe3f686f4b7f51a6b5ebe56c SHA-256: b749c2e38929a82cb4fd2d9337e5cf20d553bcbd85611788b0059f7e804a0055
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs, many pointing to compromised CMS upload storage and disposable hosting, suggest a phishing or malware distribution campaign. The file's structure and numerous links align with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/eb50268d7e52568d6c6f75f6e65bb28e/jinunulin.pdf In PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838d6ba58c1---vunasejajilawutitokefoz.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/rawefamurita.pdfIn PDF document text
    • http://lucann.com/Upload/file/rolabivodanojodorenoxipip.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/zimipogizekokanigejef.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/19720893114.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160afa921c6f55---15957979294.pdfPDF link annotation
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/60827e019da82168cca3248d892dec6d/monekirerese.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092ecb513d90---garujozozalebako.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/kilinifinezixuxoz.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/42136310927.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/dikemizunomuwuvogili.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/10972427058.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/82898018099.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9e626c1c0---2741264183.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/70553120535.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/viwogodobezazilo.pdfIn PDF document text
    • https://efnnma.org/files/file/puxawag.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/tolujotetipegirebeguzuf.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0b780e462---99281467076.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0b1a92003---10402227424.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e80be444593---10571856142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+types+of+baptismPDF 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_off0000f861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11073 20644 bytes
SHA-256: 88bbb6fd2eef720be99f089114517eb5751d3745d2e5ac59bd3a690a72338072
font_02_sfnt_off000145a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A3 10588 bytes
SHA-256: 273d5ff0398229e918f537d904fbfebe3b12af13acf868ddc273b75432f7397f

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