Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d69a90a803db65d…

MALICIOUS

PDF

89.0 KB Created: 2021-06-29 16:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cdf9afecea41dc93c665b70383ade81b SHA-1: 905836004523136652597b564d6066fae0dd7d74 SHA-256: 6d69a90a803db65d8dee817a62bfdba0cda99d935dd203f71920c1f94b706094
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. Although no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://kencert.vn/uploads/image/files/tobusitedolukuxegupe.pdf In PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d114d2d8e1---36354957080.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9471f43846---bovavunit.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8084e1dbb---gevoza.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a3de705b1---dazugumojavof.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/65945505009.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d435bae8c9---dadefexiforasixig.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/raxijase.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/66d43a64ccf5b0f9c7551a29cc37d58b/bamine.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/70159024781.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/80149997377.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609976839629b---ranewin.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/gepuwup.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/kuvopemuwipuzor.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/50578992559.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/5d22bf7f4029fe1c1b900964e449b387/mirolijodog.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ee6b7247d---rejazikepuwope.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/dusekujabutigorogu.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607693ba030be---6102269124.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/ab746b69d08009d595e64f16c9781db7/72548967872.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096027c716aa---50831399530.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/03126d146bdfcf2cd5589be0de1e4b5e/mubadawamuresajites.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087f25058fe1---wowesexos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=sda+fda+question+paper+with+answer+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 16188 bytes
SHA-256: 43aaf6b7257293a9fb3df01e9826f837cf2b9b92f506adc28ae8aac51b7d6941
font_01_sfnt_off0000f725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF725 16868 bytes
SHA-256: 6872bfd88e0a596ddb9fc6a39bcaff7ff0f0ad4147d5c0f04cc22c242b8ce724
font_02_sfnt_off0001230c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230C 10956 bytes
SHA-256: 68c3961ccb77e888a0dbce596811fd525ab74eba77454062f75aa1c99473e0df
font_03_sfnt_off00013c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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