Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3428928d9697855…

MALICIOUS

PDF

100.8 KB Created: 2021-09-03 18:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8623618c462d875cdde9fcb136316ef9 SHA-1: 9bf9657b0532c9d9a2bd635542e61b97863f754a SHA-256: e3428928d969785572d4df05b301de5cccc1adf312b284ac4fe2fdf697ff99b2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm indicators points towards a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://studio45.live/wp-content/plugins/super-forms/uploads/php/files/n53cq7hfs5ee7udt3n22crll3q/tigexarudijimekokafele.pdf In PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/31499297063.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/wojogakilakikusizixitun.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/zudemezakenogogedusofelem.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073d327d1480---nenamolubulomuliwa.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210817123736_914072133.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/38681934342.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/45441834509.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/oecfistdvf3o0ddfu9ru89cqd9/79896813098.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/xozigekenile.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/47268351572.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/dizolemasexazepuxo.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/jamonavakarutuwaso.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/zefuledoxokobanepaf.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/dizebal.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/74801150397.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/bovusuxekarolonoselobevo.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec3f3fe1925---gumitafosetebogabumaze.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/5d0e724a1b5e1045b6d2616e0cc058cc/6277139708.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/73376000005.pdfIn PDF document text
    • https://room12shio4.com/contents//files/lufidexa.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/82046288531.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf494eadf85---vetifarubexagovajoxov.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072d4626d88b---mirugabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=fact+finding+report+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_off000122c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C6 10556 bytes
SHA-256: f6e23af2ccbaab2e4dda3710fca6721dc2cf7832e23660d764601c3dbcbe1031
font_01_sfnt_off00013ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000152c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C7 19544 bytes
SHA-256: 16f8e9ee4ceec1c5562d1b633da9749ebbee5b7a2c788884722b0020428bf8cd