Malicious PDF — malware analysis report

Static analysis result for SHA-256 4733bc7c576ea028…

MALICIOUS

PDF

72.3 KB Created: 2021-09-19 08:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 72e607535f03d18c79f343ef1d1e4f40 SHA-1: 122b6c6bdbc9b2bf5ac31df9c9f10c0050b33d2f SHA-256: 4733bc7c576ea02835a483e9cfab916f016bb3932103ff2368f7b03ebdb1c8c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to other PDFs hosted on compromised websites or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URLs are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=vogel+organic+practical+book+pdf PDF link annotation
    • https://ljlconst.com/admin/images/file/11481217178.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/53056509450.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4478d329c---95764193257.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/xularuwixuz.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/renikorivanabowifoditi.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/toxalazogusoneseniwomete.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/gipikujusivi.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/puwoxunaruvaxozapamaw.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/menexowudolule.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352267b76da---27513223423.pdfIn PDF document text
    • http://vswet.ru/f/mabikejogusizaji.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/c98dnmg845d8nl23fpj1nq5q3g/65777418780.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/gizokuwuvijusus.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/35987396979.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/zikefabozilatanemurubi.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134f98f8b95d---visisowigigaz.pdfIn PDF document text
    • http://cartopack.be/Images/file/rutuf.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210904154957_1410632667.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613656559081d---liwogumesijevujuwor.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/gatutozudi.pdfIn PDF document text
    • http://heichapuzi.com/uploadfile/file/91936191360.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/47319306207.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///wubopapujomewexo.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/27079954204.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/juxawejakaganejokiz.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_off0000ba13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA13 15800 bytes
SHA-256: f8897d48e190ace899035c4b2bfe26fd8ebdf6724f6d8f17b1e487d9b4f5f63a
font_01_sfnt_off0000e2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000face.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACE 10828 bytes
SHA-256: e0950da7457ffe8a1d6be0594797652e1977941d42c233cfb2083afa45ca5b81

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