Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b27b07c9a862c0…

MALICIOUS

PDF

99.7 KB Created: 2021-09-17 22:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d5e1f13c3ec157e9e791dfa36064469a SHA-1: 51e7c0cd51724de5493124c63512212bef6901a0 SHA-256: 16b27b07c9a862c00ba6e76e6fd54973ea21558357bf9daaff9f87e364e0ae94
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs, such as 'https://krisoc.ru/uplcv?utm_term=vc+locker+codes+2k20+my+career', suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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
  • 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://krisoc.ru/uplcv?utm_term=vc+locker+codes+2k20+my+career PDF link annotation
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/72369995290.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/rojuvokevezinimudakubib.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/40335452430.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/nomovalarutafiluvu.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138a89336e66---64712161839.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/44941120119.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/77854265633.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210905_5997174ECFF859F5.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/99297792684.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/16405773260.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/57749772942.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/7126766132.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/lomenurefukikatema.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/wikarigu.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/92821899420.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/vavirejobajajapanati.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/61122502833.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/82021976086.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132c221bcc5b---40765411468.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/90946031516.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/89734057573.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/68125786568.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/71471181275.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/38281298259.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423a2c3c415---45465171797.pdfIn PDF document text
    • http://bndweb.nl/upload/files/xivegupej.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/naserosud.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_off00011f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F51 18592 bytes
SHA-256: 53255d75d958200ae75bad9729fc4ccfa546745a25f60fe889616d44fed15df0
font_01_sfnt_off00014fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FDF 10656 bytes
SHA-256: 39a6a23d8ba2d04f61d3b649ca33a415b0c7f2d68be538923b6802a013fc1440
font_02_sfnt_off00016870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16870 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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