Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f9ce282670c1a3…

MALICIOUS

PDF

82.4 KB Created: 2021-08-02 02:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: eb2344fa5dde77ec0410ec8eb22520f4 SHA-1: 7bb11368e6027cb48b166ec022193ee4c92224ae SHA-256: 65f9ce282670c1a338732e1bc13f2ecdd92d95c911a3c2552c3f433a68daa1ac
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 0.9983

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://altinay-law.com/images/file/kizuniwob.pdf In PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430002303516831.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/vidasasuwusimaxizesidisif.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/dec86dbdabae3915f23071655b048e1d/19246875506.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16106e04cc5b90---tixolawogeg.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/86931739903.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/gokotizavunir.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/jululubimigupa.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210602/file/16226086488313.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/nk6enb5nd0r2oa60ji5u46t6l4/sozelaxawojofo.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/jutapoginuzod.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/vonovozor.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/b7c114b41b653ddfbbb15ad69174d892/59272266616.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/052acb2766524aa3670e1730c7f224e4/64397389579.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a312701e655---xexopogoxasumefemafilek.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/wurebexetosakepitox.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/87312594870.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/18960845870.pdfIn PDF document text
    • https://webmenuplus.com/images/file/47681183430.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e07882458---48286359601.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d74d8111340691aef9daaf38c32dade2/55918588999.pdfIn PDF document text
    • https://papiratisk.cz/soubory/62595019789.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/jexuzasi.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608df3cc2286e---pelumozelugimixesorasikul.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/5b1dc940122bc8cb323d6184176b098a/vodizenasixon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=kobalt+table+saw+kt10152+manualPDF 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_off0000deec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEC 16356 bytes
SHA-256: d49a6af57d20ad2f4d54dd3ffc229abd064cc41e875f5a4ea3417c327a9743e9
font_01_sfnt_off0001098e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098E 10912 bytes
SHA-256: e3eac83c23cfc587e916aea0166fa83fd1c49ba01c9254ed57a5a0d34dc93836
font_02_sfnt_off00012317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1