Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c61249c8c6d821…

MALICIOUS

PDF

68.8 KB Created: 2021-09-05 19:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0b5d404d9d9176b3d50800fcfb0116fb SHA-1: b7ef19718fd5763decb975706977fdb27cdf540c SHA-256: a3c61249c8c6d8215f36da8d5378ff3b7b41cd2ad214e17f4d8581d060a3ac8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress installations. These links likely serve as a link farm to redirect users to malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • 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.
  • 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.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108334bdb655---zodofezo.pdf In PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/mdi699m01etdsvpatt3firlq5v/lopoxojovaxoriravoxuwujo.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/tufabuzijit.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080d7c668898---8271901489.pdfIn PDF document text
    • http://onlinevay.com/upload/files/jokemu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160739067ae947---43211017269.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/dinimorazemesomiv.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/16362763852.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/a37a99e6a9747e0ca36abe35057d46a5/lubujola.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/vurosali.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/4900948844.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/gibesivuzajed.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/rb1q0sie4tbn3rh1r0lrfqlgo4/ruwekajomid.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/3f9c615fd108f356d6004e4ca888168b/mizarofemotizo.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd349f3c269---20990203503.pdfIn PDF document text
    • https://activepymes.com/pub/file/lujatefufazitekelavaki.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/mibesigopitudamibosude.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c246b381a9b---basekitedojilurijabodi.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/8bf87b8a12f9105e4f7448a4417ea106/gizinod.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/sopofot.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/43801990439.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607170782ddc5---wuwaxufin.pdfIn PDF document text
    • http://www.bash.cl/media/file/wefinelibuf.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/dapilokomusafakeduduroju.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/v5uk2c5rckgmf0am946d6lknb5/dovawigakasipim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=rinex+3+pdfPDF 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_off0000b19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B5 10116 bytes
SHA-256: 258c9887e311e2c58df65f4b55512c98056d7985033bbe93f1d503dd60a41700
font_02_sfnt_off0000e061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE061 14708 bytes
SHA-256: 40402e582f7753b012026a967354ff7ef3a1bdc33a9b4acc421d15cde8267cf7

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