Malicious PDF — malware analysis report

Static analysis result for SHA-256 b449e2c3e485f849…

MALICIOUS

PDF

72.6 KB Created: 2021-09-30 15:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 007bacf392b898b118182995b2444d24 SHA-1: a7d11ae28b12ea1589d124f54cd74d6254a6bb78 SHA-256: b449e2c3e485f849504fcfb19ffe01d6aaeb5069803109c8ac996a4d0b2844c9
196 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and a PDF link to an algorithmically-generated URL reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://catamma.ru/uplcv?utm_term=lego+marvel+super+heroes+free+download+android PDF link annotation
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152f5fb09d76---9048137666.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/88752711441.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/wifufidijofedegig.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/48129186445.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/7fe0b53ab1356c972e422a515b064cc4/95815258927.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/kozarikawebapubitatugizoz.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210908182423.pdfIn PDF document text
    • http://nprofit.hk/userfiles/8541227548.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/45147817162.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/91679773736.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/32735198440.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/diwevemadikejevobi.pdfIn PDF document text
    • https://elemonbg.com/Files/File/19426374365.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/venoteviwesiwumas.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/55584479746.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/mexatisuwo.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/3717140952.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/84399556882.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/2909533167.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdf34c819a---75023348384.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/80493036376.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/61562161750.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/fagipiwefefuki.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31851086978.pdfIn PDF document text
    • 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_off0000b316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB316 11056 bytes
SHA-256: 33312163f6fc83a2ecbb5c5365355c0c42d74cf9a1ca108a8f8b451218a189e0
font_01_sfnt_off0000cc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6C 18912 bytes
SHA-256: 42140856c34748c2fdb440cde8f705580a8edfa06e34d14709cf074c7c33f128
font_02_sfnt_off0000fc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1