Malicious PDF — malware analysis report

Static analysis result for SHA-256 988b90e16815325f…

MALICIOUS

PDF

79.5 KB Created: 2021-09-04 16:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4f90c093db80e49deb45327820af1c5f SHA-1: 8ca8a83f16e82b1abd74a1181544fffc0e169f0e SHA-256: 988b90e16815325fe8c9c39286eb2927f2bb91a8b11c8ae1c0a1195340474be1
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, including one hosted on a raw IP address and others on compromised CMS uploads. The primary purpose appears to be luring victims to potentially malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://foto-preiss.at/upload_files/files/rujojaleborupazadesuk.pdf In PDF document text
    • https://ovth.ch/userfiles/files/segaxinezimax.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/968tin8l586nu7lmiv5sn93tdn/dobixubaromenud.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/miteviseleluwek.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45c206ed8e---73331346561.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/38106e32cab879c8aceabb01e7961a0f/fuwivuzilobekarorez.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/f9ca2a0c9f26b62ea8e95a47b82e34cc/95176384222.pdfIn PDF document text
    • http://all-premium.com/user_file/files/gobezobijovixi.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210904013758.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/weruwegavibofarefezisivu.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/74a47d4456cf256398889e4718845640/kamoretejijipikepitux.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/vodolirebokomofi.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/gubuzisesulukegati.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/fupoki.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/440573e8c4f980c277470f08d1490e6b/51066296428.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ee9204261---29099488225.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160be5c3bee952---71699457540.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210727173602.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/0r92tq9att1lv5nt1o3vu9o0d7/52427759191.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021060915481616.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/c67d50c8c70e3771fdab88295f834a64/kekupogiremim.pdfIn PDF document text
    • http://entiambalaj.com/upload/file/vazuwokudixozekamibumop.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/70871728867.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b279dc31a9---12756434002.pdfPDF link annotation
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f602d7ebc---14783791901.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/737b4c79073878aa1cd1b82d7c2696bf/mukusuwavelon.pdfIn PDF document text
    • https://resicolor.com/upload/files/rexepajomopududurepuvaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=gst+all+information+in+gujarati+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_off0000c77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF90 21172 bytes
SHA-256: e911e073679cca208c890910e9d9a5cfc2de26391ed6477d6c1a135d723beff3
font_02_sfnt_off000116b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B7 10980 bytes
SHA-256: 581b24445f17d9c9c354b81baaef4bc5d2895f7911e3a5c13ebb3e9271afc945

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