Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4b56162a0315f8…

MALICIOUS

PDF

87.6 KB Created: 2021-07-06 09:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7631fd96705c00fe7fad078ac0be46ed SHA-1: e51ea9fae8cff0c1d2bb3bc66279489cf050bc24 SHA-256: fe4b56162a0315f8a9217bac1a4605ce7eec19edb2e068769a89cf3c11627af1
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting. These URLs are likely part of a link farm designed to redirect users to malicious sites, potentially for phishing or malware delivery. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://irlanc.ru/uplcv?utm_term=quantify+data+meaning PDF link annotation
    • https://namratalakhotia.com/userfiles/files/46824906167.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/gmp8i6a5uvrpgj0s1pl4ujvuo2/bifukekuma.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ed0a8c0db---91243044370.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/dozufowiporezu.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/51537204939.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/sudifasujip.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/3300629993.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607497704d6fc---40806777430.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/relurofajagezizomidazafer.pdfIn PDF document text
    • http://vodnik48.ru/content/file/rorananupuzobadudezurubo.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///93848997401.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/jeserodamuliki.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/qsd1e0d27m3qb10v9sve5m9ve2/1384801808.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898398d6a90---84301334760.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/gejuvenaxowoleridepat.pdfIn PDF document text
    • http://maihome.hu/admin1/file/44929476884.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/77686653737.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/cec8c282f46814c91d7f6f80bf4b0a96/lerexemigepuxupiguj.pdfIn PDF document text
    • http://accronline.com/userfiles/file/38043272310.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/f0e7d76c0af8ee87de1f002d8302aafb/9370195397.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/81e1f5ae26c56f7404f5b97b05285f0e/46565787048.pdfIn PDF document text
    • http://www.kammerpop.de/files/file/nekibanuzojigome.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/d65164fef38810725067c90f3738b2c0/goguxamotanamivokavapi.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/jotagipife.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_off0000f528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF528 16964 bytes
SHA-256: 9626778c89fd97208bf68c23e4c8812e02a21ccb8f0edd47f67eab1ca011f5d9
font_01_sfnt_off0001215d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13974 10536 bytes
SHA-256: a30c7dabc59acb186c2ef8284f9fa40a006e45104e6fec88eb2d34b8ddd89e00