Malicious PDF — malware analysis report

Static analysis result for SHA-256 89e9af848c81bb85…

MALICIOUS

PDF

93.0 KB Created: 2021-07-29 17:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4cea3018d0d0b52ab373284cfb5110c6 SHA-1: 88589b4d8ee0289866a7f440cce4ca0c0946504c SHA-256: 89e9af848c81bb854e995cebb94d29e593ccd4fa96760fc3e04520175840d682
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The PDF structure and embedded links are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://xaydungdonggia.com/app/webroot/files/images/pages/files/46351924645.pdf In PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/g6l7uhqs8ceiqv8lnq1cb8ta91/37806964326.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ggp7bgicbclepsr4p7fm9rtanq/wububebenamatulipixojut.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/zajagejerena.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/5f8ljmn2okjofn3c1oc9so1bn7/mazogodunuwi.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fddf8b7a802---83476992124.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/8nov9ga85o56tsa8n4vg0mo43u/gefug.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210522104113703.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91322a97f---27845499304.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a632879cb93---19713388510.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/96221877616.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/21055484123.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/b2e32b6492e5de88705e0d28d6927915/nugenulaxalokomepisibaf.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/74787017944.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/b40c752cad8cd90d7796b91828e19e3c/10871494522.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b8d2b3cfa---kevajisesezukujasu.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/b04ac48ea532eef997d6ab4f619c97b9/93928003711.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/66928132468.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/mawisizemebuko.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/51f711c89046d8544578c813222df678/7185754355.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d280b3ecfb---88667450007.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b59d6a96f04---xipovixipeja.pdfIn PDF document text
    • http://xmst.com.vn/app/webroot/uploads/files/17649200594.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/mefemokajuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=minolta+dimage+a2+manualPDF 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_off0001084e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084E 17252 bytes
SHA-256: d0b1cc4ae4ea40457b7ceee92268bf5b07dd8232aa76e0cba7a4e5bd07b592fe
font_01_sfnt_off0001355d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D74 10536 bytes
SHA-256: 8dce9c23eab5c8a291c38c487c4ee955b2416e9e779506258b04c08582bf9034