Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5802530c4d5dc1…

MALICIOUS

PDF

92.6 KB Created: 2021-07-23 01:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 7877a87cca62f897d6a71e7055080f69 SHA-1: e7508f1a4ee65b4c70480a066c4834f1b9f93840 SHA-256: ae5802530c4d5dc15688043ec6feef1a1d04ae0a26c1dc59d652aad719d46121
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 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ab2563c469b6cbcf017a65fd63c9059b/ganijokomalodivepawoti.pdf In PDF document text
    • http://quangcaosms.org/media/ftp/file/sotuditoveninurikivonum.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210606234248.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/medotitiduxixe.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/69129925448.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/00t38ciphgf18r00c9malmrjh6/wusazukamurokoduravopeg.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/53612344585.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/53v6i86ukekdm5f4fa96ivrbn9ns25ec/68774002205.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/vemonuxakopipubibidali.pdfIn PDF document text
    • http://susutour.com/userfile/file/soredinazivexif.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/safixoteferetut.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f9793486d---mujuwiwixiremufebuji.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/82613976710.pdfIn PDF document text
    • http://camping-du-lac-dijon.com/fichiers/38389432860.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/9ca1c221d5e4ddbc1c7c05563122239e/51631690526.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607577d9b96e2---nuluruv.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094136ac6ed2---gekegumugekizijogow.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/fusazepere.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/fuzibapukorapekitigile.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2cbb566d15---takavasotinulapabel.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608deb4508d28---guxikowatemijurop.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/nrc03q2978dic1fj759nfepbk2/zetafaponisaxelefobet.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2acb35aa52---kelovez.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/60427692808.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/4760434445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=multiple+time+frame+trading+strategy+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_off00010516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 16620 bytes
SHA-256: bfb1efb673c36680424060374c34e0ec395106ebe33ff7ceb4b068b4093889a7
font_01_sfnt_off0001304f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304F 10928 bytes
SHA-256: 752d4eff8c3d3da91373260deb88e08a5656f6454d2ca4cef08669c099c143d8
font_02_sfnt_off00014968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1