Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42b2d1e4c9d5f43…

MALICIOUS

PDF

75.8 KB Created: 2021-09-02 23:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77efac3118acfc6a2ca19938cc8be84c SHA-1: 44d2f417a6bb2abfe585890e33ecebbb7a7f4481 SHA-256: e42b2d1e4c9d5f4380433db8e1543d97064d6127ebe8bee3f77067c079ddd290
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://huntic.ru/uplcv?utm_term=manual+iqos+2.4+espa%C3%B1ol PDF link annotation
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/77865850955.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/kipanamikexole.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e20ca877b4---88315498655.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/75879717606.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924d30b0483---83760919493.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/16771827189.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/sazaxikokelixabifag.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22346270203.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de10bf1704---wugijidasukibafovisumuk.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/1ab96a9b812d6efb6f609f7d6b900661/sokugex.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/34460898215.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0551710d6---jirujusajenu.pdfIn PDF document text
    • http://one9five.com/userfiles/files/xelade.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/fovitezuzurodewevi.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/47a1196252bcf5f326198d5b7aae65e1/goxidajosafozokazerinavu.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/pipizuboropejixi.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/rekapefekalexevefu.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/dupefegimepifigelelukob.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/zanoxebesepibas.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/90894593263.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607233dd34719---jefanebagadegaze.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b95e6600bef---nibemopumuxiruneneb.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/lafopu.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebf8956766---83431475196.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_off0000c351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC351 17292 bytes
SHA-256: 55102b31b7a470e40fd12ff5bf37898ad795dcd17a36c08deba0dd32459897ed
font_01_sfnt_off0000ef1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1F 10756 bytes
SHA-256: fe5e2a2d167b2ac1c6f1dc3929b7847215a8dd49b4221a8b4380bee9950aef04
font_02_sfnt_off000107c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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