Malicious PDF — malware analysis report

Static analysis result for SHA-256 43bf04a30012d928…

MALICIOUS

PDF

86.2 KB Created: 2021-09-02 00:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f30a414706c22459ddcd340b575dc414 SHA-1: c8dd1c427e067a11a60f3d56cdb0b99bec708cb7 SHA-256: 43bf04a30012d9285b5e842a6544509836beccace1e58187946f0f45c91ea951
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites or disposable domains. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cructi.ru/uplcv?utm_term=facetime+app+for+ipad+pro PDF link annotation
    • https://naoshima-habitant.com/52651102829.pdfIn PDF document text
    • http://tidomusica.com/uploads//files/202108080831491003.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/10820253378.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/13134160660.pdfIn PDF document text
    • http://sieuthibds.net/images/files/lunakusaletat.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/kumirikate.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/xupodat.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/gubofesuvebagipanu.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/bogumafajunazumuwu.pdfIn PDF document text
    • http://pactolous.hu/upload/file/39527789697.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607449bb2c662---jobifibaxexurumes.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16098bb2fa0724---degepaxejuwod.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/73876950238.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079452879cd6---sotaw.pdfIn PDF document text
    • http://topstec.com/d/files/42314645466.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/pitatedemajunofiwajip.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210725210320158.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/91f2ccd249d43aa4daadd0e80cd7cbc4/93863272496.pdfIn PDF document text
    • https://clubon.top/uploads/files/9295870696.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4dc815435---damotutulos.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/romegorerovawexomem.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/23358215060.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/tivosesirufokajagewijeziw.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021080513192973499.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/sajebomenew.pdfIn PDF document text
    • 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_off0000ea86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 10440 bytes
SHA-256: 26b184d9ae355a88d6dcb9c639f650bfdb4e36b7d672ebd39fa68a3799c9ef28
font_01_sfnt_off0001022f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022F 18716 bytes
SHA-256: c362321067a443acaf27ba4dba18149408252cbd41d53070e87ee6ca3e879eda
font_02_sfnt_off000132ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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