Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd47595b0b67d44a…

MALICIOUS

PDF

83.0 KB Created: 2021-07-17 05:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 592e55ab8dffc674ccc26cb2e3af8185 SHA-1: fb8093a17b917269f830a293707ecf783b5505c6 SHA-256: cd47595b0b67d44a4e46847de459e42f3e80c78805aa8dce8131165e8dc03789
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress upload directories, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e81b08592f---nuwufexineduzojeselini.pdf In PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/ac0dcdc5d5a17d5664f0e80fad8da4d2/xujutegaxumo.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/sokuv.pdfIn PDF document text
    • http://orderkai.com/uploads/files/34384209739.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/8662071826.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0ce598ea3---leserurotetu.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/46735239669.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a000fbe7940---47618903324.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/lasafuzaxugizudepit.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/cfda8ec20ec6ac53af1977afb6ecef2e/93199006383.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/38603398720.pdfIn PDF document text
    • http://www.toptehnik.si/images/56169562082.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/fatafasisuzimaton.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/zapupi.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/96b7df1ff3c76d2b73d1b91e187e3f56/49460083875.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7443b9d1d---pezonejuvebevuzakovuwo.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/27075520029.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/9b740518c45537c22b40e4e84087b894/fapakofadogidopilubinir.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/dedesiwukafed.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/luvatudem.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/cc2a9860d20d73d2a797df036831adb5/voxefosowaferapuvijofal.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/vuwuverejalurokabazi.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/joxodajedudubupow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=statistical+terms+and+definitionsPDF 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_off0000e277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE277 16696 bytes
SHA-256: 864ee152d923da84e4e1495a88f4085f1d6df49867a2e6460bb6e93295775316
font_01_sfnt_off00010e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E49 10712 bytes
SHA-256: 3bd5a384ffb4602f88c2658c514b7f50f0fd8a43593e508953cf25897236bf51
font_02_sfnt_off000126d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1