Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba638f024a6940f…

MALICIOUS

PDF

115.4 KB Created: 2021-08-20 23:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 019cc003114ee6db4502ae59bd44ec57 SHA-1: cec370bc03bb1244e29740b3a62185a263ba102d SHA-256: aba638f024a6940f777615cec1bf8537138156bf91805154eb39295cfc0da6f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://suarezbeltran.com/aym_images/files/sepotiviwamadovow.pdf In PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b7c580c20fa31ba2ac013f6fa2940970/fisifig.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/gerekinetafi.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/0e3dabd5f0f452cc35a1e9c9b1e52d32/mutak.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/54000498086.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/hg7747c4mv4jc5j95cv4keeac8/taneravesa.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/ba1cd4eee0699252422bba1bac6c450b/rozudunefuxebulinanu.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/2015390453.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/54167746421.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094d0d52e8a6---7841585217.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/kefozakego.pdfIn PDF document text
    • https://www.roadsafetyrental.com.au/application/third_party/ckfinder/userfiles/files/bebuvodalirowom.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a42946d9920---8180241546.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/30781255707.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/lajixukig.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e4b6767a660e5b95827bdff264c9b95d/sipeginiziwuxugimedolope.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/dedoxazikidi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a22d960dc63---xogivazixuvuwobi.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6fe0b381c---1131952809.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/wijonavibowazuro.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9a859db38---lovasiworemefulunale.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/304d1abe9853495a24bd38e9a37fd0fc/11531187365.pdfIn PDF document text
    • http://clarasonic.com/upload/file/35548540977.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/kgpsaiglouf491udicls5iopm3/wixiwajinelofe.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf480e51687---19555663278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+predict+paramagnetic+or+diamagneticPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14126 16404 bytes
SHA-256: 78a67404003398f7e5807262e828a75586ef4df1f24dbbd7570578e4375a5df9
font_01_sfnt_off00015773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15773 10720 bytes
SHA-256: 2f72f79e73423bd719e5fcfe7f4514a6a3372215363da31d47acfe80622b5700
font_02_sfnt_off00016fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FD8 20564 bytes
SHA-256: 7aa529da46184b0d9bef370ae44e59b2675b4cc8517073f612dd298ad1d8cfe2
font_03_sfnt_off0001a601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A601 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1