Malicious PDF — malware analysis report

Static analysis result for SHA-256 84fb44b12d20dc9a…

MALICIOUS

PDF

79.7 KB Created: 2021-06-26 00:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44abd83f9d8da3083349212bdb9620fd SHA-1: e39af1028d2df2f2c4daf8210308e23282a7432a SHA-256: 84fb44b12d20dc9afec0c76224b83b61c7afe93102eaf85d331ebbb100084a79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/buzojojibeponatol.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609863b48977c---27767296873.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608018afd7cd8---wazirovefoja.pdf
    • https://btcauction.vn/hinhanh/file/31023212442.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7710a4d6---rilepigosexumawuzipefog.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ujje01m0nrg0bbnrhgktisg4bm/60019347263.pdf
    • https://dadesigning.com/daduserfiles/files/tuwolovaderar.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/5k52sllmndvqcu7b0gcmg8su64/5489624145.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/b173581ddd540a0603f7b32059b3a006/xokixigavewuvixuf.pdf
    • http://www.lugashotel.com/data/editorfile/14596096823.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607af99b8540c---96914984520.pdf
    • http://erdivigado.hu/userkepek/file/mevowamoraxanurupepaf.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/2743ffc64bd5f69cd92e784838cdce87/doripi.pdf
    • http://lnshiyue.com/userfiles/file/20210617213309_850414198.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2954409a95---53303644061.pdf
    • http://perfekttorun.pl/pliki/4706161312.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/1grkj4jqo59hs3vdaa9kupp5h3/kolisanafewetovizilujevix.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e73e5c3ec---zugavozebimifitum.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/053277244744370330379b0057f2679e/3826676883.pdf
    • http://altinay-law.com/images/file/rifupokaxunu.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608533d7adc0c---julozubuxukixupa.pdf
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/rimezogenuzarudidiv.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=poem+ozymandias+questions+and+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3fa.bin
42d309765daffdee08d21e5f3793c7cd45416ab9c32289366df50c4d8dbe997d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FA 17160 bytes
font_01_sfnt_off0001006d.bin
8acd16b60e662452e45956e6c84afafe74a258b2bdb5ba33662b26852259ecc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1006D 10872 bytes
font_02_sfnt_off00011979.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11979 16792 bytes