Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb571f8adddf8538…

MALICIOUS

PDF

82.0 KB Created: 2021-09-23 09:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 111a55ac31225f0d277ba97a5403f03b SHA-1: 2fefe7f095f6d620f7bfcb7f1e18949d4d9f525d SHA-256: eb571f8adddf8538ee12f6be41f1845e1f308342f8a3b47e3d201a5694b54afe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://queure.ru/uplcv?utm_term=download+zepeto+mod+apk+2021 PDF link annotation
    • https://calson.garment-pro.com/ckfinder/userfiles/files/vexamisamusuzusozebiv.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/69871872060.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/vilanitudegosogi.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/miputadep.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f154e304dc---14817973650.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614049949c58c---23193864605.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/87006043290.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e53b792515e1464b831edaf286dd4e9e/fedawasopofegetoko.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/vifasesu.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/953022666.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/sojenudobukimafisogaw.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/zokarulonuxub.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137f7923850a---30776699019.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/wemuf.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/89317526616.pdfIn PDF document text
    • http://electric-kernbichler.at/jodulafida.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/disowikolijikija.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/8909361592.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/raludaloladimisilan.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/187432007.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/64d71fabd0cad7da2d3839acfae749dc/51144206964.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c3d0bc333---71390399874.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_off0000dab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB9 10728 bytes
SHA-256: 7e3591f22745d75c598981e2234726c3f504aa0eeedcdeeca4b520fae7523a02
font_01_sfnt_off0000f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37B 18168 bytes
SHA-256: c7f4523a525288cc883a3874587e846ef97ff2c95f197eae135f1bd4e7951488
font_02_sfnt_off000122e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1