Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7dd528b67a992fb…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 06:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 63b171cb234beec0aaec526f33e9d46e SHA-1: 894e671fb04bbc4c0fcd0f8e480be270ee3e21de SHA-256: e7dd528b67a992fb0292165e766fff8caab09067a16d2200b8982dc4cd018674
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links pointing to compromised CMS upload storage, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the presence of many URLs strongly implies a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nomylo.ru/uplcv?utm_term=social+psychology+10th+edition+pdf PDF link annotation
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/89a33c2998687b7dfdcfa95fda0b004b/rufuwapav.pdfIn PDF document text
    • http://belovosushi.ru/files/73868040408.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/87716184278.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/jusibakimekuzenevapoxojik.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614290fc47963---86032330548.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af379b8c6f---971684655.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/30323255220.pdfIn PDF document text
    • http://www.moyekolodin.com/files/8686084415.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/giwupakajoteluberofeva.pdfIn PDF document text
    • https://eguiders.com/uploads/lokusovesewabefizifurus.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/15676c5033687ed6387077579cbf7073/47403110197.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/67104442782.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/78843614292.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/1ee4150fff3b61e594673a791d66ee64/18582974260.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/91697585297.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/15970471320.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/gipowategosewipajif.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/97824547364.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/peladoxopizi.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/38927084337.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/2142177847.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/tevunosobegufiti.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5e928f9b2---jimubav.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/mivilibalax.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_off0000d787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD787 18364 bytes
SHA-256: cc02f07e8e2efe3602b0731125062feb29ff095b5bbdc19817ce2794b6a16f65
font_01_sfnt_off000107dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF4 11164 bytes
SHA-256: 9325cbc87701994db60fb18e5a2693663008c092519a4346f70daeca980c1b12

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