Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6691eabca8eec4c…

MALICIOUS

PDF

87.5 KB Created: 2021-09-08 06:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a1fc01989a2873644d79036962467acd SHA-1: ffd14f35eb622da2c037b9d3833c7fc4e3296727 SHA-256: a6691eabca8eec4cc64a449b5a9717821ff374e3b8b2c8e61ebdd7e37dbe08e2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute phishing content or malware. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2319cfea6ce8895c5045b2588ff8e522/80417318608.pdf In PDF document text
    • https://indiantalentjunction.com/milan/media/79240039901.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/vufiwojobexowarowided.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1c3prnsn2hpihes2q79u9deg01/bozavukozo.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/rasakivusaza.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/36096905879.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/kedogipaterawed.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/mepozase.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/3a6da4da500ab9fbcb7710bcccad5b7b/93179243291.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/c1293526509fa9c547333ad50483cf03/87054092128.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613413544b5db---gadetasivan.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/617e65tjf7ahesmou1ces596qe/84617749373.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/wutapusodovof.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cfa8ce7db---66809303817.pdfIn PDF document text
    • https://lukili.ch/UserFiles/files/bazej.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/20651007458.pdfIn PDF document text
    • https://atavio.ru/files/file/28236161150.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/570cb79f6e738b286e27ffab632b2a44/60676565057.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/mezixamadiko.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/toflt65na1idm5otar8e5uqaq5/garimuwovuxiv.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/72146343957.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/gusexurakitaxiwenibapofin.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/doxolonabibo.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160e1172ddf65c---mipinozetug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=collective+nouns+worksheet+grade+10PDF 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_off0000ef8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 11200 bytes
SHA-256: e6463ab13bdd9d87bc5df32483b0634d4e9236c5e823945948a05e2bf3c3f11f
font_02_sfnt_off000121bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BC 18068 bytes
SHA-256: f3f15a564f033893c8a600615c3a39fcbfdaeeec0c7c809c84fc8fec16808967