Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca77b6f0d6e107c…

MALICIOUS

PDF

86.2 KB Created: 2021-09-04 19:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7109fea1a28be0007d47dcd8833477ff SHA-1: 44a4e9eaecb55c7342823e125c75b99f08ba9c0c SHA-256: fca77b6f0d6e107cdbda9fe7c88dd640240aab5b57d0ac68193cbae3cd379869
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to PDF files hosted on compromised websites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF link farms suggests an attempt to obscure the final malicious destination or to distribute various malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://network-italia.it/file/fodipo.pdf In PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765b7d40945---rogatasumileguzex.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/20135391346.pdfIn PDF document text
    • http://tw-go.org/files/soxakepozinuwuviz.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/k2b4ocqmgelc5adsuka2gtr5ai/90045490172.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/murezukiputofuvukoxinadu.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/66207806601.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16093bab8e0d94---20194768767.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/1050601185.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861ee605426---danemotulakirufatarob.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/2bac7932f7b08aca31b7daad120b5ea5/jazazakejinotul.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/14729174703.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073a640df999---48734074022.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/xiwebaxopapuwopufixu.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd070df86a---pizifivin.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/v1dj0e7mledpb6fac5cmlceolm/fipawabelogikolov.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/38142989399.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/jamazilegusivuxaxoduviju.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b4d15d17e30d037cadc92fe0b1290b5f/sifobujadozoxuwow.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/sinizo.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd83016944---91015492654.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/58303720687.pdfIn PDF document text
    • https://ubranni.com/uploader/files/sujilelebopiparemafabobo.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1611dedbfc8daf---91473386988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=texas+apartment+association+application+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_off0000eb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A2 10848 bytes
SHA-256: a0414f9ec0a4ac2cd45928fdd2ff79de9b92b49ed69e71a8746a432b5446168d
font_02_sfnt_off00011ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA7 18120 bytes
SHA-256: 7b1d3dc4355f93b9c0c03b4fbf8cb589c405f18267ac852044b9e9edc053b153

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