Malicious PDF — malware analysis report

Static analysis result for SHA-256 033e4bbe2875481d…

MALICIOUS

PDF

88.5 KB Created: 2021-07-16 23:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dc43b65ad9d14b643b1cf419c68055d2 SHA-1: d1e7fa5ba6123c97841eb4c41b323642738758e4 SHA-256: 033e4bbe2875481d70b82d651bc94f275cf2be3fa56aac286d844ffaca9bb47b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The PDF's structure and embedded links strongly indicate a phishing or malware distribution attempt, likely leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://hanhthien.net/uploads/file/vipopos.pdf In PDF document text
    • https://biocoils.com/img/file/pajemepex.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/b552sg3omv1gg5eto5v7ahuvo1/gekusupudaruwolin.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/rorek.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/84435393241.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/a112671a834723056932c58b24f008ca/49928458383.pdfIn PDF document text
    • http://brlairport.com/images/file/93599854604.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087dd7dd6e75---mudijojokav.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6eeee6478---11917561135.pdfIn PDF document text
    • https://noddy.nu/images/file/xuwuxafeli.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6bb013ab8---golevase.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/47169207935.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a283c338c3a---zelinuk.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c753e77b394---xifimimi.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/96330745058.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c2b9ba40b---27873939888.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/hfrq8e3ph3qqi6ojfv4495i9vi/7122437520.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/92596734540e13749ad51fda7491d75f/diwumuriroropus.pdfIn PDF document text
    • https://kar360.com/resimler/files/51624021873.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/062251401220.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/iecj4udu3k3rj7rfk8ssld8g2v/12837985129.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/bibeko.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/ceceb09ee2c7a711c6d6fa7461f6476c/wipuwadutev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=yield+to+the+rightPDF 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_off0000fa50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA50 17196 bytes
SHA-256: b652acb7168a237f2048d7c7f36d4106fab77c6d78b058ce3179a5039f86a755
font_01_sfnt_off000126d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D0 10076 bytes
SHA-256: e0ca402c3a6921b72b0face862b9c2680bdd10cc8d67f52d44b29264418ebbdd
font_02_sfnt_off00013d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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