Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66d526b421481b9…

MALICIOUS

PDF

78.8 KB Created: 2021-09-17 21:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9c848567ee4dee4dee39e9440aebc103 SHA-1: 2c87c1541164a6a0703a7ee0794939c5263d7d55 SHA-256: a66d526b421481b91aa773db94d9bbc1f495a01cfe05ffa1aa291e245ae49442
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://burragebrothers.com/demo/jolie/beta/userfiles/files/92732667573.pdf In PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/f076d12a94d6b33567aa644c49693ec3/3761551642.pdfIn PDF document text
    • https://academiesutherland.com/userfiles/file/79630151626.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/dehgfocagen3m6l9f0daiegrek/gamolenelixav.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/0805184abe7648e7377be24b9151b68b/68110725484.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/zomabivopono.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/2021921254422237.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/18749596756.pdfIn PDF document text
    • https://dptech.vn/uploads/files/magexukemetetud.pdfIn PDF document text
    • http://metall-press.ru/files/sefapekeladexokubed.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/c2f38eba659e800680e80b6fd407d86b/xakarosimat.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355f69ad49d---36629626277.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-06/images/files/66809557629.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16135cad889160---vizaranif.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/77934517524.pdfIn PDF document text
    • http://melabo.com/upload/files/94861913480.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/figunofixedafan.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/14805065346.pdfIn PDF document text
    • https://sambelteri.com/contents/files/jefuro.pdfIn PDF document text
    • http://chinazzjx.com/d/files/tavejinosotejomuleku.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/zedoredilimimofarovodak.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/88262355025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=emergence+manga+download+pdfPDF 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_off0000d162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD162 10676 bytes
SHA-256: 7b8868f8bf6adb6b7f9e3095fa4db578707806096caec8ea57887cdc57b25c7d
font_01_sfnt_off0000e9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 16768 bytes
SHA-256: 31ee9513aae01ecbec97656662f40303ad1d51f99c1f76569fb4f377a2313277
font_02_sfnt_off00011508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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