Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5344723aab9a2af…

MALICIOUS

PDF

77.1 KB Created: 2021-09-05 10:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cfdb2fc4a7f395c7d006560b226b14d0 SHA-1: 320abd312db8c651611e344139bc2a13ea7a4d3b SHA-256: b5344723aab9a2af94c251c7517a5b8f60f324b07ca04ce97def91e2d3d437e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/lo3f41io2vnklp4g25g462rdl2/femarexixeroxofikitulej.pdf In PDF document text
    • http://afgventuregroup.com/cfiles/file/96505476791.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/sg8aeg09qco3eeflbiltjdq2a1/poxosusogirazonagimele.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a84459ba4e4---dupovenabapawujavi.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/17385177555.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/58355013396.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a1795e096c6---wufezan.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/77893749860.pdfIn PDF document text
    • http://wenxuezj.com/images/File/82954471424.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/271979736.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/zakurag.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/gixowajirupusapuvozo.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/dpp3hdhirhosp7v55g3plaimks/nuzoxepokufedimidedufuvof.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105290808.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/98484590737.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/lovejizalebube.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c207c0e74---vokufozed.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/fawutizilerujawired.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/juwariderizunubifez.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/cfac36150df9bb722970030ce972802b/wudoguzixamalaj.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/32433780358.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/pidepopawef.pdfIn PDF document text
    • https://titishop.co/upload/files/jipulamuriludefa.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/79092838795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=number+word+form+worksheetsPDF 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_off0000c8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DC 16960 bytes
SHA-256: d394b1346f7a3592deaafece7fd26cf82d0677b1f1173a13da2e38723cb31d1f
font_01_sfnt_off0000f48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA1 10612 bytes
SHA-256: 944231eb155c9d913059daf3f99399922995fbd476502ac06f785e1b674c4f45

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