Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40bb73a93e8255d…

MALICIOUS

PDF

88.5 KB Created: 2021-09-04 15:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e62e9c045dc105c40e8bd967c09115a SHA-1: 9eb9cb10ffe25eb51d4f46e0a3bc5d010b854a16 SHA-256: c40bb73a93e8255d1f019f918f809a67da21258c320b2d091a4bb5d6609e05cd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS upload storage. The presence of these links suggests an intent to direct users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://oklogistic.lv/upload/file/61440510000.pdf In PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/90959806284.pdfIn PDF document text
    • http://www.heksan.com.pl/file/99246965540.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f420b50f1---lenelozatup.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/d6f9ff31a6605c6f294e5448c2e68887/62009114026.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd79a154ca---vilapibabalajapuwusuv.pdfIn PDF document text
    • http://infosierra.es/images/editor/ketemufawusifivezexewe.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/30641276883.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/fozebiwubadaxot.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/navejaduzug.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e35051e3e04---76603345251.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/91054166090.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/ba5e49fc4a75cf95139ba87c70514cfd/43449297462.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732704bde29---nawavepeguzesedujep.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/62246394511.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/lexovotefilofimiweruvinow.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cf9799dd6---zakigobopekelu.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/xivenovolix.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2b2ae3582---57457299045.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/5fem32pnv5el342cch20jt69i4/vabix.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/novavawupatofiza.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/zepati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=libros+sobre+el+feminismo+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_off0000f1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 20008 bytes
SHA-256: b855afae1480f2e2a097dfee64d8c1a027eac5516c0dcfe632c51744a9e26314
font_01_sfnt_off00012539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12539 10496 bytes
SHA-256: e5192d6ea2b403d083bfcd8ca34820a8f34eaced83fac3d50a24ebd00b7c1849
font_02_sfnt_off00013cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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