Malicious PDF — malware analysis report

Static analysis result for SHA-256 523a50cc3f95d7d5…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 19:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e1a769d8e3648e6582905358dae53eed SHA-1: 82f0a29e95dbc7bf4fc79598f85739d912ccdf40 SHA-256: 523a50cc3f95d7d5472b83cddee2c767bb8b8e6d5d4712e1b11deadebcb441cf
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for phishing or malware distribution. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection as Pdf.Phishing.Trojan confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cerescommoditiesltd.com/Images_upload/files/jiravuxulifewowavitaz.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/uq82lg8hque9alu87l2sd8lru3/lodixesobaxoki.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/26618391166.pdfIn PDF document text
    • https://digiconelectronics.com/media/55422267596.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ce30a22de---64624262814.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/05121bb341c8aab9d1c6654691e23153/4826972643.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077ec85483b3---bofaguwedugosalupig.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/pesulazuv.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/39437081402.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854a91d1d78---salefafiselipevalupenelip.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16090fe91e449a---xemir.pdfIn PDF document text
    • https://jambumanis.com/contents//files/4312909716.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8898da3836---80606927230.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111075203858---48243454632.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/jiketilijofubel.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/66853055507.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/dovovabipuvuwopikixobefug.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/97907573891.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/bojexivopifosotujapisokel.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/5a0cb5a389de01e1d8c416a3a4ae4183/xomonutosawabekixinalev.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/f9854d81e094e9f5ab6a2a34eafcf060/83371675702.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/lukoz.pdfIn PDF document text
    • http://kleiberit.ru/files/file/vumok.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/90518797588.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/39448628817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=elf+on+the+shelf+letter+template+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_off0000dc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC69 10656 bytes
SHA-256: 6e3e5392e2b76a7b9d408a0cec4f79d480ee9c37dce2922aa0576eb3b0c077be
font_01_sfnt_off0000f49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 17072 bytes
SHA-256: 93992428050ae53d83a27cf85aa4f21feb04380120269378273e48cda2ff92e3
font_02_sfnt_off000120f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1