Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f372b19c4f91469…

MALICIOUS

PDF

90.0 KB Created: 2021-08-13 09:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 60cc404e78bbf4c28417068715e6b738 SHA-1: 4332c902f2ce6bef8e474671620b4593b4d10a99 SHA-256: 1f372b19c4f9146936f1b0b3781725c3ac40955e560d188f722218b526f599b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised WordPress sites and other disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure and link farm nature suggest it's intended to lure users to malicious content.

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 https://keluargamimpi.com/contents//files/73609207656.pdf In PDF document text
    • http://sys-svinding.dk/userfiles/file/xupijus.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/65217017751.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/3a4abdbfbec224efad4b37a1f72fee33/pituvolujojowilem.pdfIn PDF document text
    • http://abnicum.com/files/file/wapibamor.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30b10b2779---75520130345.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/77363494565.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160afc78ccd51c---63705698363.pdfIn PDF document text
    • https://aashianarealty.com/file/dibegufidufel.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160770df64e97e---73332562219.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608329511c7fd---51797788481.pdfIn PDF document text
    • https://blugarden.eu/file/sebebabowabefepipupod.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9498209e3a3bac5400e5758baede4c2e/1848365304.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/44610512528.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/90219050704.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210722_BE644363B0F297D7.pdfIn PDF document text
    • http://teplospectr.ru/images/files/xomuposozusorizokedorejib.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/l9048luseh3pdulod8vqvfd54e/venimewitokazebefosa.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d802615f69---90968139750.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb15a216b5---33626222079.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/0d57942170cf18ba9e5198e7914d18ed/nowubejuvelatezomu.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/6sk2eev41ilvlhi95r69eadhb5/fovunipinagigugosumixa.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160c168bd0197d---36206253799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=does+the+ue+wonderboom+2+have+an+appPDF 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_off0000fcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBA 16784 bytes
SHA-256: b5838ac389b55889742356d1a899079bc3740286bff5a1f5ea1269de6aee004a
font_01_sfnt_off000128cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E3 11032 bytes
SHA-256: 6696e66ddcd29bd88503a6f05544634a7a751da2efc6adb0e93de0e0527396d9

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