Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9270803eeec33e8…

MALICIOUS

PDF

101.1 KB Created: 2021-08-06 08:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: af78ef53fa40e8ab697a33bed1029c39 SHA-1: fb8537ac959f4a592c341c9692c93b33e3e70986 SHA-256: e9270803eeec33e8fdf8ee824a07524d1dec993575653beab42cc56504dad4e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/bb35d322fdc0a553217102b5e33a0ea3/pipoxaji.pdf In PDF document text
    • https://lawyerupsmart.com/tempimg/file/zametula.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/2041886494.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/9129788556.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/73aa8e690cfd19a4a25c79ac04dff395/12693869184.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/tugibewogik.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38a585346c---bagujixametusasumabatal.pdfIn PDF document text
    • https://sanagustin.cl/files/zefojukor.pdfIn PDF document text
    • http://lakes77.com/clients/47041/File/zuwidabidozuru.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/zinowevunuragagumis.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16081112e67a0f---barib.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/20966545973.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/varofafovanuxetilimif.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/gupokefitulofejotokutu.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/7ph2l3vsml5g8hdkr99bhrd750/tirepaxosoporonuz.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/64747620469.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/6272807706.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf70ca9150---96248710375.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a46949d76be---mapajir.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/xerewelisepixosarosofebun.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856d24814be---gopiga.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/buputoromilawatovinepi.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078868f8a3ec---xunonun.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/70391586967.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/74d54uphk0vov8cstlvk0i4e4d/69052584162.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/6fad504e4eed4ee7e58ad38cf3c4e057/toruwawufigotijebegab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+luncheon+short+story+questions+and+answers+class+8PDF 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_off000124a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A2 17996 bytes
SHA-256: df2c8e25358696a2238e0081906f0258bc143c3144644e2f13aa454d11e01ded
font_01_sfnt_off00015392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BA9 11084 bytes
SHA-256: 04b27ed9d672090b0e6df369bc7dfa8709e8ddaec35b24b8bf46ea2af3cbd35f