Malicious PDF — malware analysis report

Static analysis result for SHA-256 faabac225fadd3d8…

MALICIOUS

PDF

128.8 KB Created: 2021-07-02 05:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 882d3b0371fb41fd8bae39be8051e4cb SHA-1: 77b20ddd2fc438bd927c4de9335f767ae6553c76 SHA-256: faabac225fadd3d8a677c45fee365121cf5702a69dd8cf532ca52ef4ea29b1cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, all serving PDF files. This suggests an attempt to distribute malicious content or conduct phishing by leveraging a large number of seemingly unrelated domains. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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://tea-ra.com/user_data/upload/save_image/files/kurigozudiwakatulodi.pdf In PDF document text
    • http://hopsch.de/uploads/file/9764781983.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/kcca9ovu575qpdlsl9c370fmkl/nidelaj.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/92ulunevtcl3802fdf5sau7t56/gogixamobedofuduvamiregu.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aeab2c3c911---52641117072.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/nuzadejubafudolefikurip.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608739e87f811---79048408542.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac76714236c---rusolanemenogaxixexu.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/lubowegowedomuvida.pdfIn PDF document text
    • http://raczcsalad.hu/files/teludimopuxevifotododunem.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a7f79e660---sazukunifafenikosaj.pdfIn PDF document text
    • https://bataretak.com/img/files/file/29966814105.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/mubuvirowuzogar.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6452d1102---45130416904.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f3238191e---denaku.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/wodav.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/logajafavelulisugevewez.pdfIn PDF document text
    • https://pindimana.in/uploads/file/wijolopivi.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/rivukezezoridus.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094a286c8ef0---73394215962.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/rprv0ljr5lb6emv7cn0b94mup6/banagukomowowabovovufax.pdfIn PDF document text
    • https://hgb.se/filer/file/kikuzezamuvasigu.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/f1f9fa35c16cc7e03e0d5ae42fc8da73/14897074210.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/josavese.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/pixuwumubusigumax.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd31e0d8930---binerufinokejobafoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+hierophant+reversed+yes+or+noPDF 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_off0001951b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1951B 17764 bytes
SHA-256: 34ede2106d395a9a4497fab1731af53f3b97a2a791ee0615485327640fa9d0cd
font_01_sfnt_off0001c367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001db7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB7E 10588 bytes
SHA-256: bb262a4800d6723ad035cf6db08cc9349d5d5069ba0e0492234b16ac5c1280c7