Malicious PDF — malware analysis report

Static analysis result for SHA-256 355ed4992256d332…

MALICIOUS

PDF

73.7 KB Created: 2021-07-03 04:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9fe5b4923f834238dea5cb5ce1701656 SHA-1: 1fbd56b2c8a6081739f1f3e2cd40bb01267817c1 SHA-256: 355ed4992256d3323d47711f0984388ae0c21f16429b35c27bf12ca1c13313e8
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites. This structure suggests the document is acting as a link farm, likely intended to lure users to malicious destinations for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c50b508f8e---54412990315.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4270a75b19---ruwojufofepeviperij.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160838db2b543b---76605696593.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/12286701547.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160723b19a4133---vobufebodaludigafinel.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/zagix.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/jutofudoruj.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f946f20ac0---niromuxaxefidogiwudowu.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/0smlsvg64cim5am7cbptnlp7kb/namuxibofikizabix.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160df876f7572c---31974624884.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c8e856c75---gamegod.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/texomevulidabedu.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d29e18af20---8183953891.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/67eaa7e057f2ba0c7911968adc2836bd/futifuke.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/262c4123afbe3cae6a594f2da614349f/62837864485.pdfIn PDF document text
    • http://0930actress.com/files/files/39618857136.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/kexofulavawirasipiv.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c65072e65e---gifidotonolizudavav.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081809c7b850---wetiwolimife.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/50c5cd656a126ab107db06ab35622f38/nizubibilelaziloso.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/dddc421683047333214681ce51937ec7/47234328909.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1eb2a12acf---wexuziso.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/45754801336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=my+2+year+oldPDF 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_off0000c1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BF 16272 bytes
SHA-256: 016c8fc6dcc885f9adf7805775f17d1a09d054a918af8ef6d5dab8465b5a49c0
font_01_sfnt_off0000eb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 10004 bytes
SHA-256: 03c85474bfc78065cde845a9b134c74301a54bfcc12e7cb0ea823c161af521e2