Malicious PDF — malware analysis report

Static analysis result for SHA-256 0838322b3fd95c41…

MALICIOUS

PDF

85.1 KB Created: 2021-09-06 06:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f70c3c278e0bcd7edb850913b388253f SHA-1: 7bd84500b4f8a9822eb7de9e18d36834741a1dc2 SHA-256: 0838322b3fd95c41d3f406642fbde87b5e2ba1f84ced4c0b7f335cf6d57b12b5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to external websites, many of which appear to be compromised CMS uploads. These links are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=hereditary+disorders+pdf
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/xexalebixusujunukamu.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093316f6e72b---80690151979.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/ae4d61a8a076e41f6c59a7441532d7cc/39279002163.pdf
    • https://alianzatours.com/imagenes/file/35498419431.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/1sbjr7p2ros1oh9h0nbun812r4/dekaz.pdf
    • http://tfforming.ru/d/files/40445147845.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/731f88308a15ac691d625edc03a6a4bf/77047897751.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cf9007e9b---69139902112.pdf
    • http://centrumbiznesurawicz.pl/userfiles/file/lerijur.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/6c13a9cdad160d0cadf1332e91c6fdbb/90153483667.pdf
    • http://kaztelcom.kz/ckfinder/userfiles/files/moguguv.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ca2dfb5a---78021207302.pdf
    • http://www.chp.pl/ckfinder/userfiles/files/turuki.pdf
    • https://techielingo.com/fck_uploads/files/45639212720.pdf
    • https://boucherienabli.com/uploads/FCK_files/file/bajorijijago.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b60dc93bb3e---5930447163.pdf
    • http://bangkoksolarpower.com/syner_upload/images/files/41518318185.pdf
    • http://vivaibonomo.it/userfiles/files/jenitikugokiwinade.pdf
    • https://cordovajewelry.com/images/file/mutanuxenitujuso.pdf
    • http://simsvizag.com/admin/uploadedfiles/file///46714235000.pdf
    • http://nhakhoauytinhaiphong.com/upload/files/32641990615.pdf
    • http://daisytalavera.com/userfiles/files/jitilopawuladiw.pdf
    • https://samtee.com/admin/images/file/69865998321.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e615b66412---luwiriwuzabijutugitozapin.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead5.bin
e9fb8ccf971b04fc5097a672dd66cc9514ad926170664f68eab5e512b551e4f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD5 17344 bytes
font_01_sfnt_off00011773.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11773 16792 bytes
font_02_sfnt_off00012f8a.bin
8589dab953d385eba6c3dca3d11f46467cceb1c499f5c166b02272b9106a71cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8A 10448 bytes