Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec8d17ac610432b…

MALICIOUS

PDF

72.1 KB Created: 2021-09-12 13:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4dd6eaabb7d04f74e580b5601122df59 SHA-1: f191fa946e69f249138119635286716d861ae693 SHA-256: aec8d17ac610432b53aea3878044f52ccd4af29f1dc2c729d6d75787783aa6d0
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination. The presence of these links and the 'link farm' heuristic strongly suggest the document's purpose is to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://andhimazhai.com/images/files/lazazefida.pdf In PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/2ed8102a9a659a90fa3c179227281b3b/31296624617.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/46808507084.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/sapatuja.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/taviji.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/0f45771c5d9e00b0ec2c8cf9026bf19e/35768178064.pdfIn PDF document text
    • https://greengenome.in/admin/userfiles/file/viwezosatojo.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/76309798420.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/b678a7e05ed8d91adc6d6b9e541bc72b/57346089208.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/44651508500.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/batujola.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/kegoxos.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/18597507131.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/47137665050.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/38529725413.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/furusojifutevofaris.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/wowax.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210911_001703.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5bcc7851d---mufejasodujapalew.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/rinelonefigikalo.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/movetumikaxetivemimuja.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d79ba2e74d---vipol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=sword+online+season+2PDF 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_off0000b5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A4 10424 bytes
SHA-256: 1217129c94c31deb43711453692633946e604da20ff5d63c4e5a2e4d9ebae21e
font_01_sfnt_off0000cd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6D 17940 bytes
SHA-256: 5e9b11bddd0f3ae6ded003d7d19f43129edf7871917ec3ab1ceae546fc0ff83b
font_02_sfnt_off0000faf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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