Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a0861c8583e07fb…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 20:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 90964aa7f4277e1d2c116ea0f1bc8ee8 SHA-1: d657a8959faeae70d4de1d79b3e32866c8040d47 SHA-256: 9a0861c8583e07fbc2bde2f738b5a56d5ef98eeb5a729a214f6a89ca0dacec40
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be directing users to potentially malicious or phishing websites.

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://alpha-cp.com/userfiles/file/dalijitaserolotiwisu.pdf In PDF document text
    • https://12shio4.com/contents/files/93290634947.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/degag.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210902010017.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/52348568327.pdfIn PDF document text
    • http://zuche0551.com/upload/file/12483533082.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/buzeriganoda.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/tisomotibivagaxewikosofir.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/87394303496.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/vamuxataduranuj.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/1bb76f9b11b32181a59e52715f7a27a7/13361700731.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///tevepabuvajuvijetuvaxit.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/71983481531.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614467abf3bfd---wunuk.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/24209448415.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/36819996070.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/zubevabibitulikogotujarew.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/89369857519.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/xotawupusifokowepaja.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/fosujikumuz.pdfIn PDF document text
    • http://orthopediedelft.eu/files/96224656349.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/zemekidonikibagodewawin.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/xexevajejidigozewadodej.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/45ko922ke3tuue0ceki81tss22/fubamejakobewijukofaderum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=one+piece+anime+episodes+onlinePDF 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_off0000dd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD14 10504 bytes
SHA-256: bfe6998cb3396b705ed4e99d48fb0126bcc9ac2050fd293669f53c31262f9417
font_01_sfnt_off0000f4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E4 17344 bytes
SHA-256: 8b1be4e7f2ce2da0cc514a4c005c3ec5b659ad598dc9db7a73a46f9caf7d751b
font_02_sfnt_off0001221c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1