Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ab03a5d1df2cf1…

MALICIOUS

PDF

73.9 KB Created: 2021-09-03 03:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 013fc78b6ebda9e51916da29d3ca5d99 SHA-1: d6d40866ace9a5bff2ddc1ac468e0e4d7b86304d SHA-256: c7ab03a5d1df2cf1803551f63fb4a7201dfac4c2f7ab73325ee4054869ae6ca1
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute further malicious content. The primary malicious URL identified is http://lucidareemantenerepavimentifaidate.it/userfiles/files/mijikajukoragigu.pdf, which is likely a lure for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611634df9b764---liruwomuwarepoxexubejex.pdf In PDF document text
    • http://singlesync.com/userfiles/file/25616029122.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/4988207373.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/kupuwanubalexof.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/kboj0d50l0j3ial14le1ecf893/numolepomesutonutuwis.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021082720211073499.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105de3608106---54038883209.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/0b85ffa41dc1b00fc0db19899f47a37f/nideduzuwagap.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb4494fd4f---9308351281.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/xogavadobebikej.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/geseduwetosuxir.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/pexisagusig.pdfIn PDF document text
    • http://megalaserasia.com/upload///91226348099.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/zuneberubetujisarosadidu.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/77183529967.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/pfm0tcdf2vg2rahbic3euok12i/44712273602.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/18407910407.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160988f6a64759---90025533112.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/sezonadugapudokodunapod.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/mijikajukoragigu.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/wimololifiku.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/24847646093.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/tomojase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=edema+agudo+pulmonar+e+insuficiencia+renal+pdfPDF 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_off0000bd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54F 10948 bytes
SHA-256: b8cf1044936583a772af3da5ec26c21197444524462d81b3c03a924e791ee360
font_02_sfnt_off0000ee62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 17048 bytes
SHA-256: 691aa5cfb7a00adc2fb40cf64fc0b625cf59d8b9627dfaf59fc64f189af39dfe

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