Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f18fc469b2c86a2…

MALICIOUS

PDF

82.7 KB Created: 2021-07-30 15:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d30fd00bb4091ca3f675dd9abc615634 SHA-1: e86c433bfd9d94732a16fe4d111ed8471e33b5d3 SHA-256: 3f18fc469b2c86a2664233f8c580e4307335d4e8c91b303104b20d8c0d93a65a
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to compromised WordPress installations and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f605c7c7477f161d5c45ad28415c1417/kadilo.pdf In PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/867346830d3806496370d0442cf10ef7/41478417704.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/9kekvv8f5so3jbf0heclquvvj4/pobola.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/i4tqossceojeb5ngkafi4co7g3/78316887033.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/kamufimejisufenu.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/9q4su2p3said7ekk9t0031gec5/86746910200.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/69371636813.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725b120c861---lixojinot.pdfIn PDF document text
    • http://rockfordauburn1966.com/clients/8/85/8549db0cc7d1f63cce07d3be93bd6f3d/File/38538849215.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/zonakadifekiralegevavazuk.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/gudifoxadulimu.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/fbe39d25r550h6vmiu907gg211/10857098577.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/96c3de7fb090191ca3d151dbc4988c0a/vegixiremutopulemusesa.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/sau7ieqcqeo0a9cavena69hbi3/64804622140.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a981b7032fe---kakewasegatujusoze.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/pebopapunibimago.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/90718427320.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/zafowovuvikugu.pdfIn PDF document text
    • https://arerp.kr/data/file///tamuniligidisovaz.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/91150203014.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083040f691c1---jedirubijasogipur.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071abdcb1aef---94771563991.pdfIn PDF document text
    • http://rilta.net/userfiles/files/xuralovepogokedevixojava.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f513217602---vidijagini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=avatar+a+lenda+de+korra+dublado+completo+onlinePDF 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_off0000dc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2A 10884 bytes
SHA-256: 9e3e9d5604482f1b4df45c247d6dce65921093f2a8e226be27553248a174d139
font_01_sfnt_off0000f514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF514 18544 bytes
SHA-256: ebbb44fa1402974adedb2cb9db26b0148194ec64c4f5ff646bd301fb5724ef14
font_02_sfnt_off000122fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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