Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ea80e45bcb1d2c…

MALICIOUS

PDF

90.3 KB Created: 2021-06-25 23:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-07-13
MD5: e5508d2ddd3d25283068bf571449c8f3 SHA-1: dcbb95a0ef3ce1d7636147ee5f5a168c3fa2c05b SHA-256: 54ea80e45bcb1d2cb18a54c386b39be5c62a86180631cd4b8722af353c7334fb
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised CMS uploads or disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://led7.ru/file/rogonimefawelobikerixi.pdf In PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/edc4b97ef216a0cb8424d34b2f06e195/panetusakosogetakumexeb.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/doxujemukemeserotib.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4b054347e---41201650103.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb02c51964---42802428942.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/7h49tv3vbjdeiq7ge3ep1784i3/gikuxulog.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aec6ae8bea---lizesemesafiraxigipibor.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2b149f891dab707799ddaf29a65c43d3/79696124182.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa78ea0f17---vafidujexugemifefikuzeri.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/jabuxojep.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/3icpa795taktkc0r055b8slng6/ridikefozonevenorozikadej.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607768d9eb37d---25458321510.pdfIn PDF document text
    • https://codecs.roimages/file/mazuvenevabafudaj.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/368b65da6e56b6f9bd0a7b8299b68de7/7406327662.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16090eb407a087---gijasorizaxo.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/7e9e36854c3249e40a5cff005048b200/lobipudapemoxifovakara.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/21466814070.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/49353347900.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/kobuxutiwomerur.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0c9200077---wotidivuxegina.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/ad45a70ad18fcc3a58175a5b7993873e/58098583770.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/eo8fb9435v02kq92oq5ikh0av1/16887441676.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607da66dcfcd0---lirebagakolewotoseguvinep.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/pavaxugufabenuvokogu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=example+of+melodramaPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa088e8884---37067560221.pdfIn PDF document text
    • 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_off0000fb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9B 19168 bytes
SHA-256: 97947a2997839ef4d3175fd96ee9d5efe62d4433474eb5eb598ce08a77f2777e
font_01_sfnt_off00012ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA4 10280 bytes
SHA-256: 12d90f0cc8584c3281f092d8f3e9b67c6a0b157d3d26260bacdfdd38e9bba492
font_02_sfnt_off000143c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1