Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7d2cb2c0d81276…

MALICIOUS

PDF

92.1 KB Created: 2021-07-13 15:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c059f3dd7e722b7f955a1d72c8be42e6 SHA-1: 8f044992cfb07a69c917e284066339e9db6ada6b SHA-256: db7d2cb2c0d81276da394e426fde802df05d13fde242bcdcc94b493f55d54487
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm to distribute malicious content or phish users, rather than executing code directly from the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/j74su8854kh59locv8ca7cd2s4/87699491163.pdf In PDF document text
    • http://brnc85.com/clients/878796/File/26016307739.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/bemoxexeb.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/pememibizi.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/rabewime.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/55247028327.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/11281455638.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/42791842058.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e91dc9dd66b---24336845476.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/biluzuvekite.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b364c4b79---59090938260.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/edd8dd67d68c67576c02223a17956637/44077170650.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/vodupovawenokiru.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/sgj66iv6kfk5sllk1t2uuem4c3/97999769429.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/43692524469.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a529c7e6cd5---xufeligaxotebafimisu.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/719569a92d06807a81d5db77d14411e8/85508119055.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/cm7cbhtun6n91570pmm463ieq0/23765017609.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc486b7f950---wikudiliginevumuginelop.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/l78ve3b6gnvanp00q87nrrrfj4/kebozuzujopegaramixax.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/lepuxorujuwuguxi.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/25214637103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=funny+meme+faces+in+real+lifePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF096 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A8 17236 bytes
SHA-256: e1e407a5f91406a651c5c43ca77a721f11a082140566dca9da1f011c2b54cc7d
font_02_sfnt_off000134d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D2 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_03_sfnt_off00014ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ADE 10468 bytes
SHA-256: 72a8d7dd56078ddf546c74710b611790db66034e9b54c157d6f2f68d4ff55cb5

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