Malicious PDF — malware analysis report

Static analysis result for SHA-256 a144225ddf253f46…

MALICIOUS

PDF

91.5 KB Created: 2021-09-01 11:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 595c532bb557cf14a98dc51db1d20d9a SHA-1: c6b51bd5b6f278eb5af40b427f994d637a17ee1f SHA-256: a144225ddf253f46b12c09ef055fdc0222b811efe974cc897892c059c0365966
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many hosted on compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pixomot.ru/uplcv?utm_term=rfp+environmental+consulting PDF link annotation
    • http://wintec-samu.hu/uploads/files/puvezozaponeraso.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdf78134ee---zatapunekonekojogujiken.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608473075f994---zomolaminakeduvanisi.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076e99a8022d---binogezo.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/gugiw.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/8007429992.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094471e5f890---wikopiwa.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-28/20210628033502953986.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/27888479182.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210608_190841.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/509c17110f922333d2adf7142532a6eb/89909650860.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa4a7f06f54---gunetakikidimunibupuwegen.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/wenev.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/49767435165.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612db43e33298---puzuwewajuvamolukurabasu.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/30419157899.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e76d04f6---25186396876.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/5dtkcfgfkl7bjqco9deldsma85/1898730235.pdfIn PDF document text
    • https://sanagustin.cl/files/gubopitetidemed.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/04cead5f92da09ed27264870c6df39af/sisuwu.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/36456645193.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/0943b777c3aea34e33838e75289e240c/xuforonopewuluzeluferamit.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cb6732424---ganopixoxup.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c22005ffad---22930401706.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/lanibezalipemefatusaj.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_off0000fe2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2C 18124 bytes
SHA-256: 1eb233dec2596822311e617b0c078c43e9ad971feb5e53f49245888e590aec44
font_01_sfnt_off00012d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14590 11032 bytes
SHA-256: 99458e951c6145940562f3f12739e779124361c939ace28e6912f17891fdc13b

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