Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ccbd1662e1d4eef…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 01:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 173e31a943350bd0d66f21553b0c00f8 SHA-1: a8f38a7f9f2ffb45f96096fe2d72220963bf3b3a SHA-256: 6ccbd1662e1d4eef9bfb9137172cd946b5cadee20ceb255fcc93e7ed39e5ff9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://autoscuolemontagna.it/userfiles/files/pevuwaraveladokuguwes.pdf In PDF document text
    • http://stroyvodservice.ru/upload/File/saxude.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/77509067253.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/kuxibizuni.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/75472504745.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210905191914.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/wafepowejefup.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/66846333357.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/sebigezemazuzu.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/lavatewigaluga.pdfIn PDF document text
    • http://czyxchem.com/upload/files/biforezebo.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613770bcc900c---mikunexonojeretewo.pdfIn PDF document text
    • https://gilbertems.com/videos/file/buwewulo.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/vovotuvinilebenosulilebo.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/4932642072.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/rebakazolavisum.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/48313457125.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/dopupizoditoso.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///wejefilo.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/jo66eb2dgbst245jso4gpc5j9v/96422599755.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/26728054903.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/77914044343.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161438705bc7fc---pigolo.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/xidegipijopoj.pdfIn PDF document text
    • http://llux.vn/uploads/files/dotokebalifuveni.pdfIn PDF document text
    • https://europartner2.pl/uploads/juwafuzilojiturejolesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=network+security+key+androidPDF 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_off0000db87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB87 10684 bytes
SHA-256: 6bfe8e14ae080d6f9100700f4dfd9e62ff52ff5a69f090e0a6b2d5759679345d
font_01_sfnt_off0000f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 17948 bytes
SHA-256: d664c65a13d3f6881657c92435dba662c932bdfef16b40cd0cf9fa5322e27895
font_02_sfnt_off000121f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.