Malicious PDF — malware analysis report

Static analysis result for SHA-256 58fa19763a627abd…

MALICIOUS

PDF

86.5 KB Created: 2021-08-21 08:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ea1ce67d0c6033f9439b2f2a8c2cb1df SHA-1: d57545f7dd9c780cb953ddb5e2f43908afb9f4f9 SHA-256: 58fa19763a627abdcf873057380c99e714f8b30c44415eb2b2197e12ccf04d37
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a malicious document, including multiple heuristic firings related to link farms and compromised CMS uploads. The presence of numerous external URIs, many pointing to WordPress sites with form upload plugins, suggests an attempt to host and distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=copperplate+calligraphy+guide+sheets PDF link annotation
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/57343f5d2fddb473b3376b48a1735c7a/petipaxilitujonasekunexu.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b92bcadd7---domobizoborox.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/69165749061.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98e3d4bc2f---bidosadikimiviw.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/33215806973.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/574423878.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607d24d34ef15---35768471522.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/e8dfed0eb7706a529652decc533503a7/58887052194.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/89343368155.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/q3u3mcv1rbaosvb4gv9er7n7e4/84294629917.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/64010318025.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611879d4ca7e5---penuvapozape.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/7900713517.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2792b94a1f---4153256470.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/16582612615.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/82qbp378ocgib7ln6m0vurejqq/mujokarefuwuredapego.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/889f5ab2acfe211437cad8675d431c06/tetejiridodirujaraxi.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/2654b066c4fa9139f8d5d27940b580d5/98314752585.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/15108027821.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/c7l5qp43cfqc93p444frm7e4j7/wuxojoguxaxetidukole.pdfIn PDF document text
    • http://willbramephotography.com/67163351717.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/melolunifozitutijo.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/sodofobedadewizimew.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa056d8ef4---55777905220.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210707002937.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_off0000eb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB12 18064 bytes
SHA-256: 97f007a6b5328433ed5ae7836b0310aad93eb88b453cc59e112f7e462ff650bf
font_01_sfnt_off00011acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E6 10936 bytes
SHA-256: 452c8c58ca99c9082971437c46fb4f5f1dfefbb22aab7671318311b6a03e6821

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