Malicious PDF — malware analysis report

Static analysis result for SHA-256 107d05d9b1ea8a1a…

MALICIOUS

PDF

104.4 KB Created: 2021-07-03 00:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: efd83cf19ae22aad9a6ba1ae940e7ca6 SHA-1: 1ca51d6af17ecbdca918a727865072a817ee637d SHA-256: 107d05d9b1ea8a1a018e3df8efc6a02963cefd851a388cebbfd01f9b04550f67
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, forming a link farm. This technique is commonly used to obscure the final malicious destination and evade detection. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware delivery via the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/1e0df93f8f775d198587c2cf4836447e/99882006559.pdf In PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/wemapebekorataneredajemem.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/j1lv5ahj5apaq4dronul8uvg6i/80438419096.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/99576313554.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/25283ffe2c98ac9e912f31e04a6940af/fifowapuligafigoji.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd1cee8f19---66913719324.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dd89645c76b---62487743386.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8292d087c---rujiragafexubozinagoge.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a301735f9f---fiziduvax.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/65092308021.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/0f962a51285da8c2db57f0ce23c521bb/rikogazorivebuzugabitof.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/c3484df4c24438b8215a56f8bc2a37d0/21800240035.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/39657248118.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/l5k5l4dbm8oi6n2h43ir2v1cle/xamabobumaweduw.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/39170136207.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/rojepokarovupominemeguma.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/89542611391.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/f0183ddebc27828539b28afddcf0d8aa/50240233938.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/055fecebe864c6163c575c7193aa6706/zegufisimadimuvax.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210601160301.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbf29d617a---66272221335.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/vujajivuvixemuvitowafa.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/37953951363.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021051803170670554.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba466a5417---73594582950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=orp+levels+in+swimming+poolsPDF 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_off00013779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13779 17236 bytes
SHA-256: e64845aa0537a2f9642874b5e5f729d6ac2e079275c38c1f657f70a5642d98da
font_01_sfnt_off0001644f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1644F 10512 bytes
SHA-256: 93fa18fa4cd0659961182827f4f901d5dd596421065c19de6e905fedd9f13dbd
font_02_sfnt_off00017c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1