Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6f339f9b11d33a…

MALICIOUS

PDF

92.1 KB Created: 2021-08-01 09:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c9f6ddaad43b080ed54f4276df2a00c3 SHA-1: 4ffde4e8fbec7797eb344b5ef6e3168628e4237a SHA-256: ef6f339f9b11d33abeccd80c2fb127bb60911d43cebb27667610158d851674a2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs, many of which point to compromised WordPress upload directories. These links likely lead to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084845504198---jomaxa.pdf In PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987630c0f39---geradowuv.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/kusikg9rmrrhs7nu7bdv4735gi/88351765756.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a0b5753a38435fca81e6522b2f03dd4/55370093457.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/vowonoji.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210723_EBE408BEB487A91A.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/03bb891b05e179813f140b93511657b9/jitas.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/feifa9o2f4l1dn6r5a7c5etp1q/20889289717.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/v6v4jktg0lp6qgea54bgb7cn3c/26780876189.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/54973186066.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/703a5b84ee840401637817cf7e8ef869/22501489170.pdfIn PDF document text
    • http://dd-eng.com/files/files/41935086125.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/melijuvazol.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f570899669b798bd627aa1d5df4ad265/wovuwomomufeviki.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5984aef117---kokasodafufelutifatudor.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76479205102.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/58526896990.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/vajanijovolovedixu.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17a1880383---14225163289.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/16735628177.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/41821666419.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/rulekozutolupasabuledazas.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee47bb668b1---posideluno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=there+will+come+soft+rains+poem+analysis+essayPDF link annotation
    • 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_off000105ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBD 16436 bytes
SHA-256: 69467c545cfcfa7eb6f737a08bcf2a39191e48e3bb57b1ec94034968a9ee1d2a
font_02_sfnt_off00014857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14857 10908 bytes
SHA-256: 7ebb3567990066c83b6c286e9938dcedc6fd96a0eb1aed2cda161f65177b986b