Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f580f97c861f3e3…

MALICIOUS

PDF

85.8 KB Created: 2021-09-23 00:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d785ca563c000555a267bdc591d5cf7b SHA-1: 867fc774804416154e6b70a98de74542fd322402 SHA-256: 0f580f97c861f3e30adbeb28bbf387df0e7f71c5ac0f6022b0659f67ddb6415f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to other PDF files hosted on a variety of domains, many of which appear to be disposable or compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The document body is heavily obfuscated and does not provide direct clues to the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://oris-am.com/editor_up/butukexetokuruzo.pdf In PDF document text
    • http://telegid.tv/userfiles/file/fetuzodofotetebudumodut.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/78023907066.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/68547350221.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/22435479987.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7fee9c848---jinevibojuke.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/wejewufagetufidopowe.pdfIn PDF document text
    • https://soechi.id/userfiles/file/97379392090.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/buvadedetizuzewoluko.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/tesari.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/3tgfecmcpm1u3djjv5c0balgm4/jexadazowijunaxeb.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/8ceffcc1f5538847ef076f808b64e5b6/falox.pdfIn PDF document text
    • http://normel.org/files/upload/file/43881949993.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/varotawojob.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/26084524454.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/fepokitibet.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/lafakerov.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/vawamarigeturobef.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/46793510123.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/zixowaromewezumipad.pdfIn PDF document text
    • http://srilangkapools.com/contents/files/mebetodonopikezobanejine.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14037594783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=app+usage+androidPDF link annotation
    • http://abcs.umontreal.ca/upload/files/titaxadebememawasufezu.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_off0000edb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB8 10504 bytes
SHA-256: 0d0f302f37e4e2c434d076a67893490b49150567b505aa45ebc45f02c88acc57
font_01_sfnt_off00010582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D94 17180 bytes
SHA-256: a16117ef93d20497309756dfb602f21f7634b1410b80d481acbdc8660e44a84c