Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bbd4db59bed1260…

MALICIOUS

PDF

84.2 KB Created: 2021-09-11 03:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eeff477bcfa05cdebf614a87f0e1523c SHA-1: ff04786ff26999a5c2a08d80dbe4fdd0229f0da6 SHA-256: 6bbd4db59bed12605094fc025a3929343abaaba7eff20a98cecd7539b768021f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The primary goal appears to be directing users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.macrolepidoptera.hu/userfiles/files/ruzipazogenipikumiga.pdf In PDF document text
    • http://www.pattyn360.com/upload/forum/files/95900018994.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/pejaxikotomofevirisel.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/56413398283.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/201701197.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/pevimomokonowoxubugutef.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/31936705671.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/5cb4a042fdc2883ec0db7702360ddbca/sijukevodulajezular.pdfIn PDF document text
    • https://computerzone.pk/file/kinixewajuzomaros.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/latudoramisubu.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/wudofamibiga.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/pobilewi.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/8133663949.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/tunudobobori.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/pikajugabejaxete.pdfIn PDF document text
    • http://msiutilities.biz/documents/kamedowijumilar.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/gagomusuzunuvomuvab.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/zelato.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e9339f39b2a3bdc71a418f1abf751d92/taveremixovununik.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/76960720082.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/sofowuduzer.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/21267990853.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c59296dcf---8626216629.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/jurosuzixuketemitoxidara.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/topepasowasodej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=do+u+need+a+smart+tv+for+firestickPDF 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_off0000e531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE531 10852 bytes
SHA-256: 35daac37be35eb0fb952f83a602d15014e5a17035a15b821756ef64f9655c2c5
font_01_sfnt_off0000fe4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4E 17200 bytes
SHA-256: c638ee5efaa885de7d54ff00a4df6a15a9349a0ad339f1610b770ea650e0b060
font_02_sfnt_off00012ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1