Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef27659c919093e…

MALICIOUS

PDF

93.1 KB Created: 2021-07-02 17:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 705a065570ec48aceae7d23081aa46d5 SHA-1: 550fb6bbb9945fec08e930e079c9de338a78b17c SHA-256: aef27659c919093e327dcbf2b362394e7434864c5d788434c1ce09d34ac7f360
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b160834cbe---misapidevujebufevevetid.pdf In PDF document text
    • http://whalesart.com/uploadfile/file///2021062108122913.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7b4418b9d---66666383606.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/5ba1acttmo9off3s8bo53h2ap1/62218191244.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5dc2662d1---jizanulobajobuxi.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942cb5474bf---kalufadixaduwifimuwanu.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/4d4d2decb42e8b4872739af9c94dcb4b/42101631969.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/0eedeb37d3f3ec68c6836f0234fc20da/97520970494.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vopagotusabiz.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/22016642086.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e9321ed02---jizawudemitebezefumule.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/fageluwivilolutopiwilema.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b84d311e8b---keleragolumatavixan.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/30863719b73ae33afa159850a3efa564/potidiwate.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/91c8eb3ad7228ab7b92824a708d5444a/zikuseromib.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/63556764285.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/60797501114.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/fapivedudodapegi.pdfIn PDF document text
    • http://short-story.ru/upload/file/39895238311.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c34c787cb---55039573069.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/giwuvozugupesul.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/2fc3dba14c52420fa7aebce3d2283c32/fasoxefetagadoxo.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/lojugopokobibofuwebut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=why+rich+are+getting+richer+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_off0000fe12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE12 17492 bytes
SHA-256: daef0eb9f7a25327d2c5b96424eba6767f59af417cf6ca07a0e8bc2f7ed9c583
font_01_sfnt_off00012c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0C 10672 bytes
SHA-256: dd7bc5715d670e1b688586506eb37e20041103d7f521bc0f439277231a614c87
font_02_sfnt_off0001443c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1443C 1920 bytes
SHA-256: 4eeb9c1d75b788b56c7e9bbbbe0dcd0fe632c63fe71f2c6643b12ef1b984e79f
font_03_sfnt_off00014d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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