Malicious PDF — malware analysis report

Static analysis result for SHA-256 63453ff96e953545…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 21:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6e396717751c500371d1bf086293762e SHA-1: eea12f2ff0283309171e8852232d27656b90b14b SHA-256: 63453ff96e9535450bc66acd6cb4a4cac239707c31745879ed0d886cb84e88ed
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous unknown URLs, many hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs indicate the primary goal is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://ji-tien.com/userfiles/file/tekazagedisipemige.pdf In PDF document text
    • http://baominhlabors.com/upload/files/56023943986.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/gufakidoge.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/01e581fbdbcc16117c6c5b6fdf53b351/40384052839.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/42174995208.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/xoxavegelevarekubulel.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/97c7184e5fde0cdc94ecccd800bc30d8/vopelusajerarupobudo.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/tigakobututusuvijizuw.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081532b2dcf4---86375163375.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/durofatuxarakolaj.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/bekumufiluwororimes.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/verijinudilefekawarabug.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/wowelivonorava.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f86b460391---zewevijuga.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/valimej.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/porog.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ca57e85d32873ad3974c8e81202e8870/6967695876.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/nifedex.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/5820561642.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/60903360499.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/tsa30vmp8okc70n19cdnm6tmc6/ledizekekemunimuxibon.pdfIn PDF document text
    • http://voijin.com/userfiles/files/42441655656.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/jonowulav.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/75663460448.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/86438192790.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf4855a2c3---gelezapisalilunawew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=point+guard+academyPDF 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_off0000e473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE473 18660 bytes
SHA-256: 0b66e1d7bf4dae1f0b50426601fc52a0caad9d4ab3cf379aba3d4794a5895631
font_01_sfnt_off0001156b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156B 10716 bytes
SHA-256: 18f1ebb00dd51ea74ec1f76ea0025924e1e0644bc807e5ed7bbbc058c644678b
font_02_sfnt_off00012dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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