Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac2c77796e6150e…

MALICIOUS

PDF

85.9 KB Created: 2021-07-20 17:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 44a7105ac8c9887bd1d63f25189d0951 SHA-1: 401fc4e13e9256c5cddfab45bd7aa9d271268fa4 SHA-256: aac2c77796e6150e6cd6215c271f81560e515c11e7a8d03f199e471a4e650b46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://ya-ke.cn/admin/upload/fotebafolopizeji.pdf In PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/431fddf554043a4adf6dc32dd636d1e9/zedetoludovodigodexakapaj.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/02e24d5fa641eb86191c6da7f936d1a4/24216408325.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16226292283221.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/bowatuwosumizitix.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/jebimidupawesux.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9663d9b34e---60266665504.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6f1fbdd48---22660427727.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/zodudoz.pdfIn PDF document text
    • https://samudra99.com/contents//files/dizinetidukamatoxexurulu.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/vutuluwodelodadizagulefim.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/titukamudupogagegisod.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afd1804a18a---nugusigukona.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b9cbed82a---74724884309.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/zupisexajivisipugifido.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/5801477614.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091f25e5bc76---85904575073.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccae8627af---bivebugilijitulurugoro.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/38840051310.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aaeacf8d7c9---97694236780.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/35652747828.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/da1baf69741f897bfc14a9854be68bcb/19312108720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=resignation+letter+withdrawal+formatPDF 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_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10320 17704 bytes
SHA-256: bf546883bb12ff94b65d532fce39e881adc625010cef0b53d959cbc7f923b1c1
font_02_sfnt_off00013163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13163 10932 bytes
SHA-256: aa95b16dbee0344a98900d95c68d2abff66b117bd5434d2e618319628d2062ef

Open this report in the interactive analyzer, or submit your own file for analysis.