Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee0ca753da1db64…

MALICIOUS

PDF

84.5 KB Created: 2021-09-05 17:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bbb910ab97d4e4ef0e495f21b3534ab0 SHA-1: 51de68bd46efb6dd564a5aaccc418ab5d0294984 SHA-256: cee0ca753da1db64429fb5b7da7aa75f84dd0c23dccbbd1de21027be2d014454
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to distribute content. Heuristics indicate the presence of a link farm on disposable hosting and links pointing to compromised CMS uploads, suggesting a phishing or malicious redirection attempt. ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.dreamstoreonline.es/ckfinder/userfiles/files/tesemadixijigozijedil.pdf In PDF document text
    • http://studiodispirito.it/userfiles/file/govejuji.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/fadevabinapafevufusubimu.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/91800717832.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/k1a9snf59fbc7a3bbqf88v8u31/nazanebodifijaz.pdfIn PDF document text
    • https://red-adlay.com/upload/files/vudumo.pdfIn PDF document text
    • http://vejwun.cz/images/sizavowibonadomubinokej.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/47540063051.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/54170966115.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/gavabus.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/53422955680.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d337e6ac97---zunel.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608141c9ee258---nesonotufujudoxake.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/48660911164.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210725_4C948F1960F01243.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160789fb046669---79275311078.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/ua7nb43asm5lsl9g37p6h3pl3a/magutenun.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c607a42b1f3---lafugoxu.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/67306727436.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/17881418445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=radicalism+in+indonesia+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_off0000e397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA9 18636 bytes
SHA-256: fa48be5698a794e14e3cce82a7703748eb8af7528fdffd9a9e067114e82a1745
font_02_sfnt_off00012c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C71 10628 bytes
SHA-256: 61fbc1aef1d0c1e62cd226928f22015addb1d58d341b128edd1872f46f3450e8