Malicious PDF — malware analysis report

Static analysis result for SHA-256 386869175233d57c…

MALICIOUS

PDF

104.3 KB Created: 2021-06-29 04:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 07e0c41a10dd964ffc4566f5d83a8071 SHA-1: ff96e06a7912d9a26f539bad4f9871a2d9e10de8 SHA-256: 386869175233d57c93f16cdf452cc366bb48be73ca85052f4e99990df0663c06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crysiq.ru/uplcv?utm_term=quadratic+function+with+two+points PDF link annotation
    • http://polkovnik.su/upload/file/87423019403.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c537e65ef---22652729257.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/17458968285.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/vosowupik.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/3c682309fea1fd1f7d1cd88017eb33e3/torulib.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/fb2026c700159ac5bfad9a3844be7481/32366962585.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/8c5a7ioir4hklkj5ds1bi1pbe8/21405754405.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f725c2b380743778f60ee55178600ee5/88552561021.pdfIn PDF document text
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/63887956699.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/jadotivunarasokoki.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3fe3924dad0731cb1f3cfa936e67f6ed/bigivavokiretabafed.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/gc2og0db90cjfb4n31d7jtd8k6/39916876420.pdfIn PDF document text
    • https://asi-filter.pl/files/file/47643439511.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac973f88655---vorejipokujagokeluxomiret.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/95cc74ab65c69e45142aedad842eedb2/93660787973.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b3057958f---zaduvalazogonofowalonuji.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/79549331613.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/libikotekuruxor.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/2b6hkilp7qk57ncn9jpounj0va/67605490618.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160732b49401e7---27591999845.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/321f6b18a66dea078d76ff9a5d987c00/gilese.pdfIn PDF document text
    • http://targdenunti.ro/userfiles/file/wukezev.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/72112206330.pdfIn PDF document text
    • 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_off00013436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13436 18188 bytes
SHA-256: ddb5c387a209b2ce3491b121f2c6b7c9115ca94e6403524031922815e119c49e
font_01_sfnt_off000162fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162FB 10784 bytes
SHA-256: f8fa2147f53e485b374dd18a5b59fc24b610c4fa7a23e03980efaff52e27592a
font_02_sfnt_off00017beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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