Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf7269c3c064c8a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 00:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 40bc9079a9924d828529373ea34f1e08 SHA-1: 7db16d378c157a9d0f7cadc342bb0aa750b0abf5 SHA-256: acf7269c3c064c8af59823b645390399da27843db2d21fea465225cd5b520af9
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://philabc.ru/uplcv?utm_term=aplikasi+buat+video+di+laptop PDF link annotation
    • https://birudongker.com/contents/files/19965383638.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210911052359.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/kawukam.pdfIn PDF document text
    • http://petrduchek.com/files/59014034178.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/93652594027.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/24028559368.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/gupisafuvulerag.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/11187501379.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ledm1mh24ni5sr34b8bho8nq57/wigejo.pdfIn PDF document text
    • http://trieuduong.com/images/Download/41642994477.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb4731afd1---tikojonog.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/14375670142.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/63081708433.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/56791348977.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141dcd441a96---64543857703.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/podot.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161313b83477a3---13104820702.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/vediwekonuruzefumokeseli.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/0f596b16350043f9ec878fef1e8bc83d/fitisonizezemubo.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/durifofojebifote.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/birivu.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109021722452659.pdfIn PDF document text
    • http://vodova51-53.cz/files/bozuzimef.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/15645082273.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/jazanusulakobina.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/58577816593.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132c9a867a5a---wudokalolegu.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_off0000dd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD80 17288 bytes
SHA-256: ced99256b678cf9efaba10b927ebc473d514789eedcd5f616c7017b26d425a7a
font_01_sfnt_off00010ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD0 10560 bytes
SHA-256: 92214fae50ca358bbbe83a571ee243bdc0f03cf04e4c4c385369bd265957393a
font_02_sfnt_off000122dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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