Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f11e09424572d5…

MALICIOUS

PDF

86.1 KB Created: 2021-06-27 11:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b60c2b757e439f8af0b5d847c88f5b41 SHA-1: 70cc0869509e740eba59f7627ba1ea2a590f924d SHA-256: c0f11e09424572d5dfbe96af686c8dcfe3dd7ec645a2e47953dde791c3c40f08
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised WordPress upload directories or disposable hosting. The heuristic 'SE_CALLBACK_LURE' indicates the document likely attempts to trick the user into calling a phone number for a scam. While no scripts were extracted, the presence of embedded URLs and the callback lure suggest a phishing or social engineering attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://nomylo.ru/uplcv?utm_term=back+bay+bungalows PDF link annotation
    • http://healingtown.org/userData/board/file/ribudu.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/63057893918.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/letukizu.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2483632716---tizebiwoboxepugo.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49d6d4efeb---10426641893.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a70a12d745---vijikisaloji.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/nvbjnshtjfpv3iv2lguauo1v2c/jiseguledopapusuxov.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/6cabbb396be4543a3c36825183cd7253/ruzawunufurojevifovesaxiz.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae341ee9a9d---986994453.pdfIn PDF document text
    • https://atl-50.com/files/file/wagozoserugesugo.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/wefujanagexurarega.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/fatoxawo.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b566d1a40c3---35799956156.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/idg17ul47gq41ts5cla5861t60/33760864084.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/bejanajav.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8e126c52e---xuxamofanoman.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d91ade0659---lixaselaju.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/fomudidomezadi.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0ce72fdb82c039828539b16530aa80fc/xemofabepuvovopo.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/5th0bpdcpvg8bs5itevtskasqm/tinoxa.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089045547763---vonoxitara.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/m0oa12tstrtu7jrjvl04g25j4a/nezojetufaveg.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/cc3b6d3df95a9e5fed7fc27b5db071fd/24935147828.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/78826666336.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16090bdf5882aa---96217164450.pdfIn PDF document text
    • 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_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 17188 bytes
SHA-256: 8bb9334b660b5b6a9b2664845d9c0b6462ed2dd7b341b673ac40a22be49c68af
font_01_sfnt_off00011ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EC 10568 bytes
SHA-256: 058fdfd4abf3ff5103cc965980dcb529ecab5e539a3d9e830abc45eeb9647db6

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