Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc126bd9d140f750…

MALICIOUS

PDF

86.9 KB Created: 2021-07-02 03:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e7f3e2a1a24dca53b31fa39ffd6cefaa SHA-1: 220d89da61bfc0b994c8660735d430ba1129db21 SHA-256: cc126bd9d140f750324d977faab018c86b690f2083f0c4ce6fb0ef1fb32e7611
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The presence of multiple PDF link farm indicators suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=two+uses+of+esters PDF link annotation
    • http://aiswaryamatrimonials.com/fck_uploads/file/29382788267.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/pisefonilakovatisa.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094abae0c229---gulakukefaxum.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/98943309465.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0039303001619846658.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3959a6eb33---77203260258.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/75417204062.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdb010b105---kuwamiberapogozukakina.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/67567332124.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086bd5796ddd---25891380417.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/06036a78e98f896a872148efea23ae8f/91055636484.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/50408149302.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/josapo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fc59a14fe---51709560097.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/rga12t9qsje6h7sv6dfiu1nkl1/80756810082.pdfIn PDF document text
    • http://wurbs-hanau.de/userfiles/file/83581980753.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/e0138bb23f586969f7b9e5ddf3364442/voxipuvubukikoseku.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/wuvexojewerevakum.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a88b0343df---74716538058.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/bb744gveld8q7qb4kej6mcrn70/86625557295.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/qsj3vkhrgcntskctigo977of1r/44140970100.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/jesulotewixop.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/muwed.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_off0000f3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 17184 bytes
SHA-256: 7b92a9e184dcd57e61273608c2c05feda0c8a0d4d09d6c3d00042c66528a06dd
font_01_sfnt_off00012051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12051 9952 bytes
SHA-256: bc7c70fbbd520162369bec7b192af5f98c3b22ff43b41b14ae1429432b35c1da
font_02_sfnt_off0001369e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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