Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f057909fdadd911…

MALICIOUS

PDF

87.9 KB Created: 2021-06-25 19:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5d7e7c76f06b2e4f8558310b1eb6cca8 SHA-1: f8949d4406d1a7012f92457b075eb4a7d72bf4ab SHA-256: 5f057909fdadd911331b1f0bc6130fca6f6c5be0af25ebaa882e89a07c4f6565
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file that exhibits characteristics of a phishing or malware distribution lure. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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 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://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/8579a6de0e9f1d93ef48b2c4ecb9afc0/wemufe.pdf In PDF document text
    • http://atthaya.com/file_media/file_image/file/botuzavufapifowusin.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9916e217c---85385170609.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/cf6d3ac518889c2ccea7736198a16bfa/68020767973.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098bab5c480d---38089737630.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210610000958.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/pujavarajemiwowivamuka.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/gilunu.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/32268150495.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/b25shn3ngvpcgdddl8kgmvnbf3/72867610861.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081c1eb1ee21---72731210810.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/dipesubazosidajun.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c787524ab3---rikuresuwumoxaxisixipaki.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/90009651731.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d866c641f---ruxazebuwenuxipewik.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c975ea1cad9---83066029054.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd84728640e---warutuzufifimuvogi.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/nekozomukedokowinenal.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/nezokedepasutimedojig.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/wiworu.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/lalatudona.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/sugadujovajovopisifaw.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ulv5o88pqq7b2qk5iapk7n5img/8432124193.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/6rvhoh6cfbo8hbut1v1upc5lop/kanosituw.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/83afca525ff01ad86f05ebb114f62746/tidugimovovujobu.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/julekuxipemewategite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mission+impossible+apkPDF 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_off0000f0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 19580 bytes
SHA-256: 24d8c3c09d575103966f985edfe2750081344ef8b24400218c6b01ce1c8c65f3
font_01_sfnt_off000122c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C3 10440 bytes
SHA-256: 96d0027c075739214440d00b6d8989706f76a88bdffc6c00fbcaa0def7785b63
font_02_sfnt_off00013a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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