Malicious PDF — malware analysis report

Static analysis result for SHA-256 3baa98dc5e85cae7…

MALICIOUS

PDF

92.7 KB Created: 2021-06-10 05:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8986c39a7685eabd2c643b236bc2905c SHA-1: c40f645b8771e41853221e32f15e4029466b4bec SHA-256: 3baa98dc5e85cae703cad6f4c8e30700e2ef231045c8862fefaa1a60bfac4dd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8788

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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=frank+edward+songs+2021 PDF link annotation
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/b7c27bf2f462ea24ad360391ca870b12/6920819379.pdfIn PDF document text
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/48810936762.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/petamiwuruteterixo.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/9a974e2a277007dbaf32db6a9108fe89/34336064330.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/fd39e579f986b0b7af58b715b0c3c156/lijubuwup.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/22f1cb121805d16865be91447456ffd1/kemelakirabij.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/42j0ul4lof149gccu7oopuhpq3/45075467060.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/pqk4ebbama7f8mgaqb3etgabb6/63891500688.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607079a0bef12---xabigavosip.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d96f3942d5---10233325801.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76717e135---junofad.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/da68e27dfc1acd7d1fdcc6cf9d674b3d/rigozekasimizupete.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160833c1a11d2d---70063691504.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080db0011873---mizobunut.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/b9p3vk6mrbh95l6ij83dgpalv4/musojibarunobamisedep.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fodivonav.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16070a92fb3b98---99994258199.pdfIn PDF document text
    • http://azizolace.cz/images/file/24485492903.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68E 8404 bytes
SHA-256: 3dd8490412b1af018ecd6629b8e107329d08369cfd21ccafb790da2d24901f1a
font_01_sfnt_off0000fcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC3 6868 bytes
SHA-256: b0bfb0019ca029fc171d376747501cf4aa33ebb838d89ff2fe686abfee364144
font_02_sfnt_off00011404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11404 5400 bytes
SHA-256: 4d76d29d7c26c6edaa1c33ed9a462dd7f5e38b6c0d465b2c7414551fca208674
font_03_sfnt_off00012684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12684 2092 bytes
SHA-256: 9fcfd2b2c12c9d480c0beec3ee39f05b9e518edc5177a7a5fcc68dff0371f8a2
font_04_sfnt_off00013025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13025 11440 bytes
SHA-256: afaa7c1999d53322ae4e3827c878e029e7b87faf4efd34063d6c10773a322a18
font_05_sfnt_off00015799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15799 16512 bytes
SHA-256: fdc341d61ffc829696dd0497daf9fa9ea04bf6f01f1ffd5c443c298d0c446bd4

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