Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8dc652f12ad8674…

MALICIOUS

PDF

71.8 KB Created: 2021-07-16 12:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 310c716eaec7f519140f8953972ab6fe SHA-1: 2fb9b1f868e831e6ae74467c7a38fdeca568da72 SHA-256: e8dc652f12ad8674e36da73660fb07aaa2fdbd41088a8d8a89b2c494d0a09fc5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, some hosted on compromised WordPress sites. This suggests a phishing or malware distribution attempt, where the PDF serves as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://transsnabstroy.com/userfiles/file/tagopoparedirivowa.pdf In PDF document text
    • http://astorandblack.net/emailer/userfiles/file/bolojud.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/b90dd6f9b04eb3fd7ef0040aaad7cbe3/96823041290.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/panokapesaguwen.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/ad479a292e8ea11c6bc9ed68d08656e7/43975772807.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/ua56jmjub8ovpv1tkhugbgep9j/xexoxinomogevugiwemuja.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a67f1c38318---93081553022.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/jujebajisiv.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071a4ea027d5---kogewuxowefesunuxot.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/81669523297.pdfIn PDF document text
    • http://bougerpourstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/80799443690.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab5bd2a1e8---66297052964.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943cca4bdc4---78635495054.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cd93e5b5f53---54848906220.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/16808279334.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609606336c3fd---naxibafaxesuzirus.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90b21f32e9---pizigesized.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084406a24df3---tipasodukezekozeguxojolil.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607af0fd3ee9f---89780747091.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/682e938774787a3ebea54d9bfb3fc3e3/laxiximutifi.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57f28489c0---kekewoxunopusemuragagove.pdfIn PDF document text
    • https://areicon.com/images/file/kabakovuwax.pdfIn PDF document text
    • https://corghialberti.it/file/58460842214.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/68gjenpt2qfou9h147qdsveih4/22575457504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+craft+a+wither+stormPDF 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_off0000bb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD373 15212 bytes
SHA-256: 3a9ac661cc315bf667c1371630caea0e7492a4f180f4d46b5da15a58ef1a713d
font_02_sfnt_off0000fa36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA36 10528 bytes
SHA-256: 726853aff6e8dacf4496923e5459db5fdf334db8eb18a7172e79219f488f9aa2

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