Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1cfeccc62d4b99…

MALICIOUS

PDF

71.5 KB Created: 2021-09-03 06:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 991a3b97901eb0ab65c979b43538c4f1 SHA-1: 9b5bdd9f2b6daae967a8d8cacd27bd67c67d9d11 SHA-256: 2a1cfeccc62d4b99f201f63d048255e2d5c2acce47161ec2e6aeac10d041599e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and links to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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=sequencing+events+worksheets+grade+2 PDF link annotation
    • https://kalitelivideoizle.com/resimler/files/wuruzejex.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160892bf423fa2---76716008105.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/xamudirodododif.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2c6764f52---63893915078.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee7c8d35b---61990025788.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/keximuxabevofot.pdfIn PDF document text
    • http://rideco.hu/upload/file/63238140906.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/peweguzaronilaxexu.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/68890079948.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084b95d4a3fa---56515613880.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/cb30240adf33b64c903325f93ac2b3a9/sumakatuweviwine.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d1bfcaf2f---lujiwipejijurumizalaze.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59228454821.pdfIn PDF document text
    • https://redac.ch/upload/jafavusamar.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/57015758831.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b16a6d1f4d7---dewugenijavik.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082264764de2---89034249660.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/78833692800.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/89372099852.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/tivuba.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/89044938540.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f2ba69510f2---18964865419.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/n4stbnqca696gdkio2u66jf175/86617133175.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/2iisuhs9fh08qcvc1m3gb55mr5/42098718568.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/86176316994.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ead3088c1a---55463061171.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16120ccc6a614f---61480019853.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_off0000b8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DF 11288 bytes
SHA-256: bb3f9cdf6c0847162e47a1ef7ffac9ea530beca29e6600ed34ff702690d53b7e
font_01_sfnt_off0000d2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F9 14740 bytes
SHA-256: d339ddb0b587620070b9006e3b3c086b43ac5d28b26208909bf23bcbabb1358d
font_02_sfnt_off0000f7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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