Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d2b1a303cef7ca…

MALICIOUS

PDF

83.4 KB Created: 2021-09-03 15:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7231b03e2fae76e1d0fe39adb8d3021b SHA-1: 9873751875431e11bc8b4074e38d051ef4bffc09 SHA-256: 25d2b1a303cef7ca1a65f3e08d8fb689355d395f9d8e9e9b0b3dbd230e04230e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/193b4b379d432f2a22bc253b67678a8e/gaginoxusidobutotejasi.pdf In PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/fb183f4e01bc4103ee967538536c73b5/farupomiwil.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/53434443924.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/24146a51f4b68fc857408bef49767a4b/biwomixineguworarora.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4b6bdf8ee26c73ac07816ba681c6b38d/betifugutababigujes.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/52598186391.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/a59218d47db712a0187f8b918dc79ac2/miwif.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/pixadegi.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/17761501608.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16140753498.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/kazujijunibapanoj.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/98801464066.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/06636624e1cdb77d262b085d038a2adc/41532153109.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/14547152284.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/23204175579.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e08eeaf17b---44819184805.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca26ee373f---37790166438.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/69517975326.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/84889276672.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/c2b39f4964bab44bb4aab01df9fd1b6f/jumowalofinovor.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/95375026061.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/af65b3da160aca8ea5dcec1ab9a91ead/88188286543.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160969a08261a7---kakumowawobubozajotexaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=30+day+eviction+notice+illinois+pdfPDF 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_off0000e10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 10892 bytes
SHA-256: b38e59cd6e0bff16cdc10998508f7c4e8c367d687ca34bb77778df9957724db5
font_01_sfnt_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 17552 bytes
SHA-256: 3497477aceb6a665312f2b1a86722bb55bfaae70186e94852a6cd78484b48a8f
font_02_sfnt_off0001277d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1