Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd48509f0c63ba37…

MALICIOUS

PDF

89.3 KB Created: 2021-08-11 10:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5e71c8dc2786ac0d3ad63107ceb4eb23 SHA-1: 698cc40d5f9c14937bc1329d143f8cb53acf93f4 SHA-256: cd48509f0c63ba37b249efab365b3584ca6a3511e6d977d3acb3d7a469e1a187
156 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. Heuristics identified it as a link farm hosted on compromised WordPress sites, suggesting it's designed to redirect users to potentially harmful content. The presence of multiple distinct hosts and URLs points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/1en5bjtupf8uhqdb1h2318mins/98721643317.pdf In PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094835b086f3---watelez.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210726182602_1982207974.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/79cbm5snh0f1b8katrju7q3t4e/98558771599.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/dodakolabidegerasekuli.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cf98b3bbaf2eb02488c4715d9d3af0c9/59066778400.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/73382950675.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c51116703---kerifazobaxetebeduxela.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/fuxaxojifirefo.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608468316e676---vumabilovivalazetel.pdfIn PDF document text
    • https://defaico.com/d/files/rogupukixezadubowogujuwe.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/b49c3ce657653ff45664034ddbbb56eb/28595621703.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/32208767372.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60b4d42ce---69617488716.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/pujevogigexesuwokipekeg.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088a210b7271---13724299374.pdfIn PDF document text
    • http://erpos.sk/data/files/95638248635.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/c9fec7dacead74261c4bc0c8404a39ba/53404587599.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d40be25e81---gupipuvu.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/085851ff28d36f3e177405281623bbc7/71685928583.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d045cf6a36a830ea49e355fa3824a6f3/jofivirogu.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18d20235e4---15434128535.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/82869975478.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/5264262394f1a0e45e438a5cfd778c59/68534688282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=order+of+operations+without+brackets+worksheetPDF 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_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 11116 bytes
SHA-256: fc102eb465e7fce0c122369e5167e7e00263b14a250ad16d5efb1dc39dbbcf21
font_01_sfnt_off00010f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F47 17776 bytes
SHA-256: 6ca93110aca5cd1fe8b0cdede3fef9c2e2d59e560b60ade892400f8470037812
font_02_sfnt_off00013e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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