Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55eaca92ca48998…

MALICIOUS

PDF

88.7 KB Created: 2021-07-31 16:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b2d9f709cc1baa8dc0e2ac6f432894ea SHA-1: 52dcccb21ae3a8fd22053e6af82291f69e39569e SHA-256: e55eaca92ca48998db34eba911b76ff109576f0703fc187f25afa202e624eccb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains a large number of embedded links, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and link farms strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/edc75d140e1b3349af588afc40c3d7a9/zoxuj.pdf In PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/wusawisijo.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a61c54d32e---8967393492.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/gavaref.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/dupefegimepifigelelukob.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f209976ca7---mejiditefixolisefatiwejor.pdfIn PDF document text
    • http://mp-journal.com/media/file/76357997085.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/381205617.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/sibapowatebatedanuforiral.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160774cb716137---balorowofetimapo.pdfIn PDF document text
    • https://strechybenesov.cz/content/zurebe.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/e65o543vi8ai5jrhk7iniea2s7/27002776233.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/metalumulerokivojoxenimum.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/fekobasufo.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/90096036219.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cc8fd4d45fad8c9dbf6ef34f2aa365ad/badeguluro.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae33106f9---zanobanaxaneroli.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e5seklrjp3ojmkq0oa884mgjc5/lorutuzetatopotokazar.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b7507158320---81106356729.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/cpmadusp2iv0r7gt027tqdddpc/88975187087.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/13910652563.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073640111534---mekitebipanubujofanepe.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/81856005521.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088eec15add0---torinenuzub.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/tobetonozibixativojoj.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/gepafigexel.pdfIn PDF document text
    • https://paulins.se/anvandarbilder/178/files/98088976348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=why+is+my+dryer+making+a+loud+screeching+noisePDF 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_off0000f890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF890 16176 bytes
SHA-256: ae6737f0feab8e7de86420721ba4cc347ecd47339c939af2fd7623ba148b7613
font_01_sfnt_off0001225d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225D 11016 bytes
SHA-256: 5579345db224ac6e772080b32eb840d5fbebf51261747c922cf6c23be5b95dcc
font_02_sfnt_off00013b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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