Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f0fff5f6b7947a…

MALICIOUS

PDF

75.7 KB Created: 2021-08-28 05:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2bde45ff41463170296a32c773854668 SHA-1: b058773b8e05cd9a14dde781175f4a6896c2b2ec SHA-256: 12f0fff5f6b7947a5b5e073ea27f61c142feb31c0627189943713b330f8425d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The embedded JavaScript likely facilitates malicious actions, such as downloading further payloads or redirecting the user. The link farm points to various domains, some of which appear to be compromised CMS uploads, increasing the likelihood of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://motolargo.pl/userfiles/file/20611730255.pdf In PDF document text
    • http://bidmitt.com/img/files/file/riwubinemo.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/jajojizidadorezuze.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a899fb5a81---vetisogakarimopimijuxutol.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/jagavibapiletusafabag.pdfIn PDF document text
    • https://digireg.si/upload/70201176555.pdfIn PDF document text
    • http://sun-eko.eu/files/file/dewiretebomigilaruw.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o3ioc6uar4eqt709cs0qfn39f5/95167442208.pdfIn PDF document text
    • https://akconta.com/uploads/files/xeroxoxo.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/49140242029.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/32314239790.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/61588961300.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1464ae5756---jawefividedorenifapijox.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/mupogusalefuzidil.pdfIn PDF document text
    • http://techbis.pl/files/file/sexikodu.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/79397284716.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b3d2ae4a---donodusonisufexavoguboj.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/waxuga.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/23/file/19410412145.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/32092797185.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/66559892631.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/dajusoxune.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/zivadipafelisisive.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/98785653145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=story+of+joseph+in+the+bible+summary+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_off0000c32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32A 16960 bytes
SHA-256: bb0f353c0eb37abb4d7f91923509f3dcd5ec6554f8940d48e62d18027c7aabe1
font_01_sfnt_off0000ee35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE35 11320 bytes
SHA-256: 9934d8b90947d58979f0f8b1ab26e80d2b2ed0638aa0ae02d07f24e5e01222ec
font_02_sfnt_off0001085e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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