Malicious PDF — malware analysis report

Static analysis result for SHA-256 5190ca1f7df9197d…

MALICIOUS

PDF

96.6 KB Created: 2021-06-26 23:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 00232620ec9a61c98d87da6ef432b4de SHA-1: 952f640c7c06e0ca0657ed151815c9059921001a SHA-256: 5190ca1f7df9197d2427913f995da5a79296e117bcd2a1f588ab9d02368c6b5b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The presence of multiple distinct hosts and links within the PDF supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608df907af122---87279356986.pdf In PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/117c13fc6bed51d31a444904dd3074eb/siguk.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/b5422781a699ba21e4b5cbb46df4650d/fenagaka.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607743178311f---sujenufadalo.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/62662838757.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/3147a541fd6dc94b584928d157627ec7/nawasepexexoperovokifir.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/kiwupekufaw.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/49672063510.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae4c06b46c---91313894106.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/2985338135bbe213b5317d51f192bdef/lovanezumegud.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/2k7bj4fbea48hr1uvqnjik2rvr/fodof.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/5394640687.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/7qjkd9euapep6bf9amgkias3v6/remir.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/4e79faa16dfe76597f9e6effd850d495/41593448632.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/d336ff72d24a545e548f0c4eda0c8658/22479398997.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/66236201760.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/tafujemap.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609479f9be12c---lawubagetulegajorofar.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/ncqiiduui5mlvfn9k85bv7vv8h/losajadevenomegegidigazu.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee7340c694---10927105888.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/da2363f321a04171e39274af5b61d18a/39690577103.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc75d3c13c---wemuxonelixajobun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ticker+symbol+for+american+airlinesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF28 16232 bytes
SHA-256: bf3ac2bbc5511ca59b022801f68684aa2b8ae7661b1a55c6866fed5ae8d27d0d
font_01_sfnt_off00011506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11506 17256 bytes
SHA-256: 4bb77bfa532bbb027113d3b16b3a77a9f4755ee6161a776f45e8aecfc964d8b8
font_02_sfnt_off00014252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A69 10708 bytes
SHA-256: bc21e7749c8edf6247dc810dd196c6c5c5e10baf8eeab381e3f3b97f973e9c6d

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