Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccdf1df2cfa01289…

MALICIOUS

PDF

80.2 KB Created: 2021-10-25 16:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 152842c03abb92241cc3aa5273cc8ab6 SHA-1: 25793b42b248f786bd1ecb08822c2de11852790f SHA-256: ccdf1df2cfa01289c114e82ebd22857442608755ab7bbe042deee39458f72973
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Installation

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document exhibits social engineering tactics, instructing the user to disable security software and press Win+R, which is consistent with ClickFix attacks designed to bypass macro restrictions. While no scripts were directly extracted, the embedded URLs and link farm structure suggest an attempt to redirect the user to malicious content or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://monikaknoblochova.com/userfiles/file/gupodazebubamef.pdf In PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/sajavop.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/tabazobugoderikajifudad.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/h54sl36gatp92pt2b0lci5bm9n/30385027062.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/67354900114.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/foxelogokagagavonavo.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/foniwugowurisegitukex.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/66689821783.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/81717686242.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/9532039923.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/57853236376.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/kowibixaxifijut.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/5294664187.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/10047053850.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/20146870895.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/murerudug.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/46871437867.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/46279295917.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/87eabe1bd74991b3d74f6ec4e2224e75/xogusovemufipitej.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/17701470599.pdfIn PDF document text
    • https://bu8m3tas68s-b1.com/contents/files/52391476475.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/43589113674.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142ff59dcb43---fobawutasinupuwiw.pdfIn PDF document text
    • https://yellowstonewildlife.com/nerumikalulewud.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/16323555561029208908.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210913165336_950065419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/HKUGBsJGI0E/uplcv?utm_term=how+to+manually+open+ports+in+internet+connection+firewall+in+windows+xpPDF 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_off0000d458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 11172 bytes
SHA-256: ab1c888dd945dea3a077898a036d468f91eee7a5cec6736aa9d14b688766b31f
font_02_sfnt_off0001069b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069B 16792 bytes
SHA-256: ef3f80b594daab42079bd45a4b985b3d776d6aebddbee029d92d3aeb4cb009f2

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