Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd88e6c5825c222e…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 06:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa4c2aeabbf5493f2731bdd214c540f6 SHA-1: 909d5007c452c6a0f3497d817bb1ee63ce17de30 SHA-256: bd88e6c5825c222e3cf840e3c84f9365d8d9eceb1d2530f2adf66ac0451cc898
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The embedded URLs and the overall structure suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/4d51526eeb55c563cc126d850e12745f/simonekulagag.pdf In PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/rarejajazorakekukeribe.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/tinivi.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/58445483478.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/76517153123.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/51812414334.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/74024677581.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/pavazikusumibatosiguvab.pdfIn PDF document text
    • http://rld-carbon.ru/file/gotulibelewomesulexo.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/71324126849.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/xajokevebiniz.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/mbo80k1c6h3govdkbi99vc0cmq/49122825002.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/54841204010.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/sakagawelinew.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/reloxeretipoju.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/pizarodiseraz.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/71319518370.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/5f6de7a75790412bbdbf2de9dafdb025/99261166970.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/1152612432.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/93781936319.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/falejovalor.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/64e9cc73560e4486f2b68ad10e0a2fb3/26708660010.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/wemolopotiniditipimerako.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/70972278770.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/latejojagudunepezikipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+download+free+fire+without+play+storePDF 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_off0000d978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD978 18392 bytes
SHA-256: 94a865f17a631ed4186adafc1b4b3d00171fafda68e4e58c38c6da5c87eed79e
font_01_sfnt_off000108fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12113 10884 bytes
SHA-256: 8f9bbf83b23798f32869d84be2d24974a28c7c970ad805c4d3d25a2438916a3f