Malicious PDF — malware analysis report

Static analysis result for SHA-256 0049cd816627118d…

MALICIOUS

PDF

74.9 KB Created: 2021-08-31 03:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 962d7034c35b7cb2fca49f0d5318a48f SHA-1: 75aae7b9c8ac536616a06187f13f3d381667a749 SHA-256: 0049cd816627118d9e26f8cb8276ab52898c491f2ff99d6cd5d2a20290ac7531
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://banhangcongnghe.com/upload/FCK/file/84311609250.pdf In PDF document text
    • http://yuhenganquan.com/userfiles/file/20210614120609_2075302865.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/60282658071.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609746926e9d3---sodigadonanufoboligo.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/54162551458.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/sodalumexabuzuxokijok.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/8u4gc53aj3mqess7bfsopujtg4/4718273249.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e536a8bac16---regofopix.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/39919267633.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/78228342045.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/13332608198.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/29377691503.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/pevajematexeguzite.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65f486ecb0---26867118407.pdfIn PDF document text
    • https://arerp.kr/data/file///90131417629.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/dee6a2627bf8c0d48b4041039da63103/93922282865.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e8cc1c2b0---26510333014.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202108290154124551.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210817_162208_127.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/51f04723de757bb3941045afb13b63dd/tusojixojoboz.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/simatafadimijudoxowupab.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/23921313556.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/738lkfl59uute15uqit2ft25qh/68709103787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=bakugo+in+maid+outfitPDF 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_off0000c1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B3 10496 bytes
SHA-256: 099623182768a236e142a4748d5e88e10a903f7c5e97382f33b9a18054d2154c
font_01_sfnt_off0000d95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16C 17212 bytes
SHA-256: 08a2ebb127de2dee49901e85d722eba186f2120d173fb38da55d0ef830a6f698

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