Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44386e32a79c34b…

MALICIOUS

PDF

73.3 KB Created: 2021-09-24 04:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 84e790366e5f6e8880551ba59fa015bc SHA-1: 8dca0bda34eb3c0acf4a6f41f1252cb825dfa75f SHA-256: a44386e32a79c34b38929b36eeb7dc43e6e4f32926aa52dfddcddf6d0a9a82f6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites that appear to be part of a link farm. Several of these URLs lead to compromised CMS upload directories, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://ventmetal.ru/userfiles/files/miditulo.pdf In PDF document text
    • http://cablexconsulting.com/Upload/file/lesuxetamerif.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109022227222847.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/50860194911.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d243e63705---nubinukizajumudusoz.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/70ba859fa0c7861caa1616ddffe599c8/lajaze.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091104251473499.pdfIn PDF document text
    • http://yuha.be/_files/file/2605921328.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/27216063161.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/97655432438.pdfIn PDF document text
    • http://novafish.it/userfiles/files/pojamegekofonofuranot.pdfIn PDF document text
    • https://ferropula.hr/files/51536725538.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109080944511588.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/wimebo.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/vujusuxejagavevoxadonu.pdfIn PDF document text
    • https://guadix.co/ckfinder/userfiles/files/tuzisakozigewevabogobifav.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/55368992025.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/88678806461.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/93818142963.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/buzojotenowewujaf.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613580c8e7d62---moxebodumetonomasifa.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/76723380639.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/7822686556.pdfIn PDF document text
    • http://wjcopy.com/upload/files/17918902365.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/lijazipewifabim.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vvr62s2lt8cv3ia4fd6h8p2h67/kilemixidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=gba+randomizer+pokemonPDF 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_off0000bedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F2 10572 bytes
SHA-256: 3a3ad1eb2dcb9da00c723bd2d2aba02e5940383a139c2b9fdca48ae1716d20cc
font_02_sfnt_off0000eece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECE 16020 bytes
SHA-256: 72264928cd6061ccb388ee101ab137f16ff8c8c7a0cff94d809cec62c79e9ef1