Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c59fc0ba3c5ce2a…

MALICIOUS

PDF

130.1 KB Created: 2021-06-26 22:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a4566aa790cd3686e984e7637876dcbb SHA-1: d02b6a2315a36f0f508d62f9e1aaef94aeb29651 SHA-256: 1c59fc0ba3c5ce2a36da75001c183b3094d8eec71f06a07b3a00c63ba89f7105
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The PDF structure itself appears to be malformed, with duplicate object definitions, which is a common obfuscation technique in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/tmikv5ujj1hi4shcofjolr13eg/pawerixejutoj.pdf In PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4cad4535b---4308808766.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607586501202b---taresomirazajosegon.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/30228716786.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c022c037e82---63975143138.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/99467047878.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/pesiwenarifogum.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/regavurutog.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c99503ccfa---36872043149.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0829469ca---85847677135.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a08817f30a2f300d337ac2dbe444349b/mopavawutufosoxunezofafa.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160714060cb662---6211054463.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/0e8b293beb4afb240fb4e4bc1fb07c7a/lufinorutogumijo.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0349cdc11---dimaniru.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebe2b82cb6---28980061245.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/26077caf5d0679169b9f9c29e52d7204/megurokurobijak.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd0dbe7cbc---52907854106.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/60798164258.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160859f775ae1e---97943143582.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/85602426867.pdfIn PDF document text
    • http://russia-ex.com/gofexor.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903650667d1---bakupunukuwabajoladalese.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/75772617916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=topic+assessment+form+a+answersPDF 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_off00019af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B30B 18064 bytes
SHA-256: ee076dcf4dce9fac0c4e4358f4bab803f3c13a148b99d84b625f6772b496a70e
font_02_sfnt_off0001e28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E28B 10644 bytes
SHA-256: bd4d4796b46dc2dacc65a360d7c947cf3049c4f7e5d40db5b0633787abe3cd84

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