Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca69c93d10cb5651…

MALICIOUS

PDF

102.4 KB Created: 2021-09-04 22:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 957e8e475bf73445c3d49e537afc4646 SHA-1: d22017341af4593bf3465304d949e7ac44999690 SHA-256: ca69c93d10cb5651256669047fbf966dfe0ef0af451b13e24eb0baa096d9092e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://crewmak.ru/uplcv?utm_term=certyfikat+kompetencji+zawodowych+przewo%C5%BAnika+drogowego+pdf+chomikuj PDF link annotation
    • http://amsasecretariat.fr/userfiles/file/60807404616.pdfIn PDF document text
    • https://anfauglir.com/images/file/bupobine.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96dea56c26---mokaratijeworeka.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609415b2f0c55---6866975227.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eecf52dd35---wuvavawewetebu.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/wudokokixakunox.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/f972cb61e1585f284ca736e3c58d6eaa/wikapetuj.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deb9578bf7d---fivorovujopu.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/1b0a2d5bb951cc257b32d5eede40e286/82032180249.pdfIn PDF document text
    • http://tulga.ru/editor/files/zoxepoxu.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/e797367039434928d5daa6953172501e/15416180696.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609592d75c81c---24521989860.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/43756229250.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0385841998adfd5cd1750953067854d0/31920448613.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/58594528874.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613222b230331---55462164682.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/cnmvgk3jjcstps7fvja89sfa0v/tibibotamo.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/likizowexokiwab.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/miwegojafapado.pdfIn PDF document text
    • http://ruresept.ru/files/file/62010041351.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/basozusugoli.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088a858558df---25775071039.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f2bee276b44a67ab25715f428d2e67b6/xufosi.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/11125898904.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/gixifi.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_off000127a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A4 17188 bytes
SHA-256: 7447bb425bd278eb29348a41c8152e2b88ccc7e12966e9843b476a6a5b6d4c70
font_01_sfnt_off0001550f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1550F 11548 bytes
SHA-256: 7229c77f9ea3e8a4ab0e098a27ccb339ee4d279d0eea840e5e90c57ef109686f
font_02_sfnt_off00017014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17014 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1