Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae1be5e4906d21a…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 16:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f525655d76e75a169692181e12ae7cf SHA-1: b5b1487b7932db3aa48d686fa46406148872a9b1 SHA-256: bae1be5e4906d21a5aeafb5aa2e72bf8d35b3470a83a2c80be8f3edc9d97798b
180 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 9

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070fba84e860---40491324929.pdf In PDF document text
    • http://bezpiecznamlodosc.org/files/file/zomixivoxe.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/9e5a64e60d7289d9a35bc1f10e2d7444/fobawatusijaxiwipivosug.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084cdcef036c---goniwigalugif.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160753c7f4bdbe---nogalafotijesax.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/da12a12c37bf441575998fa066006417/gagoraribix.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160983d140b9e8---nopurelowivujeregigo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16123bb03d3c1e---37704732734.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/26221106155.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/tebewamulo.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-7/20210507091147642252.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/fq927p3k38ev7t7oklb9k7k2ca/67125691477.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/92262517998.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/e1c45f7a8faba2847b0e308f826eef39/47308163452.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607047dc3c562---satibimap.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/99692995520.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160954ed63427b---debem.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930910c1acb---46373951471.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/foxixe.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/83128906799.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba13639d2f3---5807812618.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/lanuratupifupuxud.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/81291621565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=omdan+pdf+til+jpgPDF 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_off0000d5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C4 18304 bytes
SHA-256: c24c94304f6951875c75c4f8e6a4c2997660c439d920881f0fe27114d6f39d46
font_01_sfnt_off000104ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD1 10476 bytes
SHA-256: b1d7a8e8afd1c9d4bb5f4ecddd09cfa38f3263866f48a18f5b61740910141b1f

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