Malicious PDF — malware analysis report

Static analysis result for SHA-256 8338f1c9058a52d7…

MALICIOUS

PDF

90.0 KB Created: 2021-07-03 19:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ca8b6a7acd43a8a7d0765a52b546705 SHA-1: ac51629e8092e181fe7ac1b755791cde1b2aace7 SHA-256: 8338f1c9058a52d74d0bb923ef69a312aab087f8049772a6c287ed71e4bad16f
156 Risk Score

Malware Insights

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

The PDF document contains a link farm, with many URLs pointing to compromised CMS upload directories. These links are likely intended to lure users into downloading further malicious content or visiting phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a233ce3ac0b---jawasetawari.pdf In PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/bed6cc5b7f2e010638211cc6025591eb/72120315994.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/e35f3f859e44c8de386877d4e4d7f8e1/sowepowiwokirof.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/15065082836.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/misixu.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/31ade8006653436b813ec2d523e96821/84030351763.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/zowipagaremoxil.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/nesixifuveso.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/mewaxotigiwoginu.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/3349542cbd71a3349be3fbb8405cf568/vonurevalow.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/fbae15eddc49c94c667a2f94cf60cc0f/wepagopabodobijinixip.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/d29a94c3ec2cc1fc689326c20f4e56a8/68760065889.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/i51bhu80jnrbpsu0bbp0d8bj6e/vofezadaradir.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/pekr756sin3085949reh4npuv0/wajejuvirupatanore.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b6e23efb7---584336797.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae20e8234a3---revox.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/35946699559.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/ko6eng3tsrq323ord5bhmhtjv3/funumimezesusagudunemi.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/dazagesokir.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608655f9bfc35---94903324237.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b374bc7fd0---rawuwezuxojefibuzafabej.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/078c98fdbcc8bb2c209536c89af774aa/wesonafomave.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/12hp8uqlh23ubpnedl77mgb57j/67591385523.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/xujakabisutakuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=companies+act+71+of+2008+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC1 17380 bytes
SHA-256: 1a19d0de865b4d87f6c57547bf3fff7e4c65ad1b59d054c6ce89bb768bd54a87
font_01_sfnt_off00012858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12858 11220 bytes
SHA-256: a33084011dca1e8b03c6a8764d205caf61acc0709efc449d3744ed2e5a487fb9
font_02_sfnt_off000142c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1