Malicious PDF — malware analysis report

Static analysis result for SHA-256 149fdb5c16943dcd…

MALICIOUS

PDF

72.1 KB Created: 2021-09-06 03:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2115bfcc0f1881952cf12e760e4119d SHA-1: 8dbb43baa306431702be556ab956f5949f0cb649 SHA-256: 149fdb5c16943dcde58c7b9d9036d9d0f62652c044595bc37f9a9ce986d22cbb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF 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 potentially compromised websites and disposable hosting. The primary attack pattern involves presenting numerous links, likely to trick users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.la-rocca.pl/app/webroot/files/files/vurik.pdf In PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/kojomitijibulo.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6818b9f6b74c1f486aed5e16d836d7bb/gumibipupadufimaferevefu.pdfIn PDF document text
    • http://safetruck.gr/images/file/46968588024.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a2add153ca5d7ea5b30a3b1eeb68d1b3/jopujomenuwewepon.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/7c4dalbs3p56ugg8coi5nfc1kr/kerewirewa.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/51571173230.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/fa829ce606898c31cebbc9bc2ea2d02b/5890230578.pdfIn PDF document text
    • http://rentaruedas.com/files/others/voninalajifa.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/sudigedegojifivu.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/tumisemonivozujudosap.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd7cfc3850---zafopebinen.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/budifelo.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/dutomitamumipudezazer.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/jnrh8lun1343i9vk55bgd79ae4/nitolejuginabe.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c901429447---89216218769.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aff4d151aca---fulikumatu.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/15360410992.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/97464119234.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839816c0ad9---nujanapoporaro.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/22610643367.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/lolegexodejofinasamuzuzax.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3172aae04---koxizotafewetiroruxojad.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/99088274942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=properties+of+materials+grade+5+worksheetsPDF 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_off0000b926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB926 15520 bytes
SHA-256: e824c875a5ffe1c30aafb3f618ae6423a416261d963e0a062371b7d67f0f25f9
font_01_sfnt_off0000e0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BC 11156 bytes
SHA-256: 1dd08c5ae12ff1e88613752474d77b00ff472d9a3f9cbf4370d2fa3a19ea18c3
font_02_sfnt_off0000fab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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