Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1759ab9c2c26f66…

MALICIOUS

PDF

76.0 KB Created: 2021-09-01 23:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: de53217679d54bc6706fb58b0887c730 SHA-1: 12edc0527857a5eba39a9110b86efaac1d161aa1 SHA-256: c1759ab9c2c26f667ac28cc5abb60c9bbf563dc0d4b174e38c7e215728cbc5fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious and a phishing attempt. It contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary URL, https://krisoc.ru/uplcv, uses a UTM term that suggests a lure, likely to direct users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://krisoc.ru/uplcv?utm_term=milky+discharge+after+ovulation PDF link annotation
    • http://mimarkamilozkartal.com/userfiles/files/86220896781.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/23811847112.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/22ef3f7e0192a254e4221345dd8459fa/80492594425.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles//file/sidasanekotunute.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/45117432783.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/uqvspia9mcqlm1lhddmunfobr7/76489620415.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/6970136200.pdfIn PDF document text
    • http://axwelindia.com/uploads/87216512167.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e20bf068ba902073f810d5c0c69e4cda/91825947935.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/g4pcir9m8cdsqind4ni0r21ng2/ruwotavofomukuva.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/36c6a35673fa76b8ffa05a0cdf302d69/67163493031.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/42522019070.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/39558273572.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/3959755169.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/13588583178.pdfIn PDF document text
    • https://zzhqhi.com/d/files/83966813870.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/g29131tn07ghg2n2lqqdlsbjt1/79558909762.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7bcisu5vcg70mt73sr3m7lnlj7/wewejolojitas.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82d34a5d72---tatapumawex.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/dojefavinivuduvu.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3891cb446f6380e73ddbc4537663ac3f/sesikanunigatilob.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ae464a4c---62372128902.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa687c3fad---nizitinet.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_off0000c725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC725 16120 bytes
SHA-256: 8c3836fa2a34300ab4ba930da64b95729312cf0474f2ee887cee562bbbc3371a
font_01_sfnt_off0000f047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF047 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001085e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 11120 bytes
SHA-256: 80663a215d505e0e42475105cc88433ac80c151226ecafe5648cc5d1e3a671e0

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