Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91ef778a942112c…

MALICIOUS

PDF

108.7 KB Created: 2021-09-13 09:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 11960c7c9001c1ced218608bda55e45d SHA-1: f9e2f6d1a55083bd0d5ebe1ea020f3acf8cea062 SHA-256: a91ef778a942112ca8be74aa293a3c99d0b5036754b085cf86fa428ed60b74e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kawanmto.info/contents/files/ponapiv.pdf In PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/teloluvujunonev.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/xevodaz.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/vireriguxesidopanawur.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/45e2566ed3837587771f58bb8f64114c/lifutovolitujimaxin.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630449080/files/pujaretizajif.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/xalaf.pdfIn PDF document text
    • http://recrute.fr/files/files/weluzirefafuzez.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/pilisopugedokidux.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/sobimakefolibenap.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210904004746.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/dapijulewerak.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/runimufebunumisage.pdfIn PDF document text
    • https://kuepancong.com/contents/files/kuran.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/genenorobifakakekeridaw.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/50604477895.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/49972761537.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/duterizovuwux.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/26588291669.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/fezazanaxuga.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/42524d1c059270dc86a1cc614e52de1b/89838403650.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/68941370462.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/49uovsabdhr1i8ihjlk2p6cjth/27948030669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=harry+potter+watch+online+freePDF 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_off00013fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCE 10600 bytes
SHA-256: 7ed0ad19dc99474b8eff1248c2bfff41fa6ba64bd1aa7b2a41a7d7d7a4d75abd
font_01_sfnt_off000157f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17009 20044 bytes
SHA-256: bbd7b892f5b120ed51e55ffafdac8f24b9c6f308c23a891bc3aa6b0a96dc4dd3

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