Malicious PDF — malware analysis report

Static analysis result for SHA-256 70660d6530b819c1…

MALICIOUS

PDF

76.0 KB Created: 2021-09-04 12:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a5079ff4c5f61b9da3ab57a5bb8f403a SHA-1: 48cb950c587c0221870944e05ab7a5e5320a9e17 SHA-256: 70660d6530b819c17ef556894cd1c4d9eb99f603d810e33a431d99a31c5d4b91
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories. These links are designed to lure users into clicking, likely leading to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16124dede47e19---57938904213.pdf In PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c302ef55f49---pesejimepu.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/84406010301.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/97312367686.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/tenowupesaviwurugos.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/42836879519.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/99019956605.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/967198b7f9a0026ccb8970d86f878889/pikomevadosijexokezivumi.pdfIn PDF document text
    • http://aqcons.vn/upload/files/fuwutepolimixosog.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/bezavafofuladaf.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/5015917146.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/54224103789.pdfIn PDF document text
    • http://synhbio.com/upload/files/83620797315.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/toguzimudovule.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/runogawuk.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/xodarisedurizokopijezove.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6110FE15BCBFE.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608af3f1ee661---31926042108.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/30736476504.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/5f08d7702e9cf3c6006b42f207e9644f/nileguzafuz.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/jovonomidujevirajel.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/jovolopotav.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/46238079668.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8f08a8100---nenizibevupoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=applied+logistic+regression+hosmer+lemeshow+pdfPDF 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_off0000c3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A2 10972 bytes
SHA-256: 6d91dd64654f8fdf76ef60c651b672ce016a48d7d2a03cb1252a24a866d67bb4
font_01_sfnt_off0000dcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB4 17564 bytes
SHA-256: c1eb669933de884b1d3f6c78a22cfa419a2518b287e9467977724aeb4ebdf783
font_02_sfnt_off00010a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1