Malicious PDF — malware analysis report

Static analysis result for SHA-256 53a95068acad36ce…

MALICIOUS

PDF

85.4 KB Created: 2021-07-18 00:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e813b4f159416fb397acfac7768a8a8 SHA-1: cddbaa348560797218bd62dc28cd347f0446def7 SHA-256: 53a95068acad36ced074b644751bf4bc06d7d587d70bb8bc844e2f770eb9f268
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics strongly suggest the PDF is intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • 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 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://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/i04l6d6djahtuljthlo3f6i5te/41538483803.pdf In PDF document text
    • http://amdind.com/userfiles/file/35744877626.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/jeniluxezeruxoxunij.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/6tbliacfodu881go346ihekv03/43287731854.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/gufuzinezemo.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/71682823145.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608740320b7e1---rulusafi.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/7411bb275b28ee8aec573dabe543063b/44057602587.pdfIn PDF document text
    • http://toroisg.com/public/images/files/64955884627.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087d3f219689---masoveseluninonawogozuxe.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e24a6e1913734865ec4195cb408201dd/sewavixiku.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4b5d63456---1243603918.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/6o858j7df50m22ooq09r85ucvc/fuwibopexut.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/wekuvole.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fedbf545db---naxasorofirodetel.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/45465628388.pdfIn PDF document text
    • http://learningkey.org/userfiles/82365705823.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/e0tnpsuacei4kffersoh2247v2/xalefitidazunimi.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/40808453764.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/rofewamutobuzawi.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6235338f37---54561015815.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/p6su9ahf5oucl264u3vohua4ml/bapixetuvufigo.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/6fa88efad57f89e37908beaca842fc34/48254099507.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/jitug.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a590bdb7f1a---sewixaxanimigotivufajizik.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/3b95bfb0673fca5b85945776e15e498b/widinulatonil.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/atvf3adjutvvkagdcnfidr0365/33356206565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=minecraft+mobs+not+spawningPDF 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_off0000ec85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001049c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049C 10996 bytes
SHA-256: 11a0b199805b875cc6ac773ba031eba9f84a5e07f7f7d9ceb74da136a580d448
font_02_sfnt_off00011e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E08 16280 bytes
SHA-256: 1929ab289367977010f16946761c32343a14c2d58770e4e3191bbffb29ee118f

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