Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb610468876b7a64…

MALICIOUS

PDF

84.1 KB Created: 2021-07-15 12:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 257d5d0275575bae73c408533692b6a3 SHA-1: 1cd1cf4ed78f2b4dfe84819645a005e26e6859bb SHA-256: bb610468876b7a643f221c86856288e45bf8f3d1c74f699f75de0bfdd70c0bc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://cructi.ru/uplcv?utm_term=fractal+trading+strategy+pdf PDF link annotation
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/db76e9568ffc48c75231e49cafe2b34b/dageberel.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e674b4a4d8c---pejovewovazijigesizigopa.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/13524722795.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/24630878508.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/447b239303497a5ea8336a296c86a015/jerizofuzo.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082efdf669d4---79702527913.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/sivinuwutiwawo.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/c5d6dc9f1fa404be43b2889111e3d92e/52999115846.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ec515547922---likewuj.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/rubunamejuzenago.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210709101653136.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/6hnfb7rq7uu8tq29982iuahj86/powizekipezesidu.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/jugerinimoturi.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160de8dac8ebf6---zigovitizufipefuzuxu.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16087d83812663---bigizewezoweberojuziju.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/62307896429.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/14958942622.pdfIn PDF document text
    • http://schokobrunnen.com/idata/99291723516.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/e02a19c9d20837fa8395263c9aa653ae/30975551028.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/lavuvagizinavesej.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/53990705280.pdfIn PDF document text
    • http://bociany.sk/media/file/wizodofofazugoza.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/ravegujixipenoworawedane.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_off0000e5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FA 16880 bytes
SHA-256: 8c6af9acb5e9e9d0fd4e54322449a96e1cf14f5450cfc4ff688226bf8e03ebd3
font_01_sfnt_off0001122d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122D 10764 bytes
SHA-256: d354221ead6ab52be0fc1308413f0ba0e5adf3d256ebfa1e7d0fb8ee3dbc88e9
font_02_sfnt_off00012ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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