Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b4ad1458e3efee…

MALICIOUS

PDF

95.4 KB Created: 2021-09-07 13:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aac466cafb08153a64c4faaf9382e915 SHA-1: efb98926ee798d2f15e04b3b3263bfa4e4c87963 SHA-256: e0b4ad1458e3efee5d7925c3045c51f688ab073428d1b80c28ce89ef0d5a4536
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to redirect users to malicious content. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest this is a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc84f48629---32839110856.pdf In PDF document text
    • https://agrilaui.com/userfiles/file/mokofamugovipemumitov.pdfIn PDF document text
    • http://berbun.com/user_img/file/ripitizibekanisonatiku.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/bec26fa39101a46229b220777d952196/60648279796.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/77053091539.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/zeteronelar.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0941c205---34401031293.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d26bcbff2---tinofozojizax.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c6906ba3c641b6ce56bde196570b542/tilinoderenu.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077f1cfb9175---60511756441.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/duligizapozilima.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/mccof2mgs00hjj5taqsotto7r8/gakanadifaluvesuvab.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/sesezagal.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edbd5b8299---50590191645.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/sawidebag.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/88654169765.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097c3f42891b---kugobakubefavuxamet.pdfIn PDF document text
    • http://446888.top/userfiles/file/mudifuwalosifijuf.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/57411149858.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/53944702221.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/24488898155.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/popuzadositejetuz.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/golekomuxanikogebe.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1a54b89fc---soripepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=intersec%C3%A7%C3%A3o+de+planos+geometria+descritiva+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_off000102e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF9 22204 bytes
SHA-256: 7304bea551291e96ec93d5dbd64da07504bd4eaa448c795f0d9eb3b014fc04db
font_02_sfnt_off000152c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C0 11444 bytes
SHA-256: c0cbe53940c0e080cec01b81892fc1192b14a5ff5d1aeb9ed9ff5362564e0e73