Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d3a218c52dc8a2…

MALICIOUS

PDF

85.8 KB Created: 2021-09-02 02:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20b00f91052c2f1d15dec0cfc0a99671 SHA-1: 601c0131c0aca0c939dc268f8a2942191b6c993c SHA-256: 87d3a218c52dc8a2e8ed1b8c17355379d7218638e3d852987e2886577c1d67bc
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload directories. The primary attack vector appears to be luring users to these compromised sites via malicious links embedded within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160cf02520db1c---37320381233.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/iidtfba325q7s1ho57hi12vsc7/weduretonitijijoreza.pdf
    • http://studioprogettoarchitettura.eu/userfiles/files/xasujimavibovudol.pdf
    • http://taxicityplus.ru/userfiles/file/gisuvetagufi.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/d043d4bcd7d981f18d74ee0284c6c549/gidadozuvifefigo.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc6f0069e5---dizusul.pdf
    • http://navigator-nsk.ru/userfiles/file/giresoregim.pdf
    • http://enjoy.sk/editor_uploads/system/files/logaletelitoti.pdf
    • https://villamishkan.com/310renonew/front/images/files/tarexufu.pdf
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/8341070153.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/5cc0f2ba0b088aa2ba05f2eb737e0080/89903001984.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/3038f3796e5dd604d04bf00d6a32cbaf/dadunomuze.pdf
    • http://suchanekstomatolog.pl/files/file/12949113317.pdf
    • http://emeat.ru/var/files/bowiwavuwezowuguso.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/fdmef9tbc7it7tju9gf3051epc/lotixarizedovap.pdf
    • https://mo-space.space/web/img/podborky/files/84938843931.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/3b35d48e2217ac27d13c1c04f8c1a72a/14297530518.pdf
    • http://chanhungcorp.com/images/uploads/files/70928532818.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d278a268a---77705249710.pdf
    • http://simkoongschool.com/uploads/editer/files/xepoxipiratijad.pdf
    • http://homeopathyhongkong.org/files/mififanirol.pdf
    • http://hongphuc.vn/userfiles/file/89485841209.pdf
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57765129527.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=9+tailed+demon
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e229.bin
a399b5c3aef421f8c04cb9a064a1fd3a12e26aee822ff798969fff66793ea778
pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 20984 bytes
font_01_sfnt_off00011900.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11900 16792 bytes
font_02_sfnt_off00013117.bin
00bed7b8960662842556257ea6c9f140e58afd063b34e5f645e5344362724676
pdf-font-stream PDF embedded font (sfnt) at offset 0x13117 10212 bytes