Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a11c48dc843dcb…

MALICIOUS

PDF

71.2 KB Created: 2021-09-28 06:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4be4e562551c1ee00668437a5554ff35 SHA-1: 8cd49ead8b0785ae0d6e7ea0131691c423dc87ec SHA-256: 49a11c48dc843dcb420e919cb61af8ef005ed1f5024ac0d48f6e5768865ede1a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute links to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://kayapaliinsaat.net/file/pubigifezane.pdf In PDF document text
    • http://cuacuonductudong.com/upload/files/56829997628.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413916dafa8---sadexuj.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/11483713103.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/tawozamifiras.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/75907749831.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/33755032774.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/zukigezurorekidusexa.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/93423937143.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210912_153311.pdfIn PDF document text
    • http://myatkinsonfamily.com/userimages/90763356596.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/sowara.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/wimutubi.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/zajibovu.pdfIn PDF document text
    • https://onecre.com/images/content/files/watenibefugedarebi.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/25616985768.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/70809809305.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/3198627970.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/a6850cbabe092a7ba3d69011e418e1e2/vuxasuzapoki.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///lobodulikesi.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/43021a787ef7f91d073d066ed5c0c148/60049123514.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/99734939626.pdfIn PDF document text
    • http://contelex.it/userfiles/files/pidazuzoraje.pdfIn PDF document text
    • https://zzhqhi.com/d/files/welodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=traffic+rider+mod+apk+gamePDF 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_off0000b399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB399 10600 bytes
SHA-256: 2c3639ab135fe0a1065ae4fb66734b2304624c8dd37f4da1b133bdff4ad0f705
font_01_sfnt_off0000cb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9F 16888 bytes
SHA-256: 6039fd8c38d023ea3fb6a47e155a72faee651942c1fe5ac869f30ce9d13efe75
font_02_sfnt_off0000f71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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