Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a1078ff167621c…

MALICIOUS

PDF

85.8 KB Created: 2021-07-09 04:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c38c50dadb78e89a72c8daf0fcaea639 SHA-1: 942689c5957b007fc6f8eb809e61c3ce2686ff5f SHA-256: 39a1078ff167621c629ea96748634985afb1e10499d6003153394e2d8eb125ed
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://boxerdapolenta.com/cmsimple/images/file/vugorimolowakifarepifimu.pdf In PDF document text
    • http://showplus.ae/userfiles/files/fegof.pdfIn PDF document text
    • https://actorconseil.com/files/file/mitulaxavodogogokejip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a954b0e4118---71917353265.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce3877950a---93229585708.pdfIn PDF document text
    • https://bloomeng.com/uploads/93127148468.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d69062f5f0---kubobaxuzemitomes.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/ebeda0d23c57a29f769c3865c7a13ef7/pejimelifakotu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d41050c3939---32172440118.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608181268e9ed---wevuxarosixikosutasosiru.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/pugesamupiwudidopu.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/1b3e0dcc18dd32c2e745c3b5f036fe07/10251716077.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a71bd10801f---18658868331.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/77e96bf474ea6ab4299a974ac96b3d60/rakofuzogobonojaniguf.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/7u24tkm78k27j3l7ljchi40j65/42578190395.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a197a0b44a---goveminixawusex.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/nbqggpt2gmier3n9dl9r9g62p5/jeximinuwizig.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/77002470915.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/35099883605.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xozopegud.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/33083464529.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/2d737rcakm9a1318j05jtbu4vb/sexox.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/b6d7d8e626a9471f432a4fe8016928fd/vigubafonufezuxezoparig.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/pesizuvotobev.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/81809498602.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607227dcab289---6818411321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=overexposure+photography+definitionPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/geretejemiwizajozukipu.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_off0000ece1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE1 11140 bytes
SHA-256: 287b33264294728a1420de4e8bfcc6b1a4d0d6d062bea5a9f7aafd46d418ecae
font_01_sfnt_off000106be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BE 16836 bytes
SHA-256: b90ca824f5b4f54e102f100e3f0a5c862664c9bf9dcfb22118e49bea93ac65dc
font_02_sfnt_off000131d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1