Malicious PDF — malware analysis report

Static analysis result for SHA-256 12470d544db3c957…

MALICIOUS

PDF

79.4 KB Created: 2021-09-19 07:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e97c99b6cfa1b125e0ff26a294f82073 SHA-1: cd81521d9813378b00b9da420ca1705fecfcb6c3 SHA-256: 12470d544db3c9577cfaa23f6f419c05e13e220a128fbed55c2c14e9a6c72f52
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://blv.by/upload/editor/files/21458102914.pdf In PDF document text
    • http://zh-huaxun.com/uploadfiles/files/sugimonowowerisiromedewer.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/33960acb092bd01bfa31a3b93e7b381b/mewunozumisakorudu.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/jeredusebos.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/bodomosefatezikukateror.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613947f1cdfad---rikuruwi.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/xoxin.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/sawepodaxafitufuderidab.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/72288817501.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/92911897441.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/20331249347.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109011812351312.pdfIn PDF document text
    • http://jaqalsports.com/files/file/mozonar.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/lixanopalufer.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/41369435506.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/89835619415.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/25984567921.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/1016303436.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614010ae20e79---lalunakazigawozisas.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/nebisusekiguwemu.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/lujiwenoxeburelazuzorolu.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/vuwuvomuduvarewojag.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/gikugokimedomov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=die+beste+kostenlose+wetter+app+f%C3%BCr+androidPDF 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_off0000cd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD74 11000 bytes
SHA-256: d788d61d98f442f42661ecf605c5b02b719132cce3328cfccd7cd43284f84971
font_01_sfnt_off0000e6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 18244 bytes
SHA-256: 08867b2d41b851b333004de2264f07d5fbe368dd44015a121198f2d83eaf19ff