Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ae1b8365c76563b…

MALICIOUS

PDF

78.2 KB Created: 2021-09-15 23:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 79e36e3f237445e243dd9423e6746990 SHA-1: 4a08c3d3c5c59e021ab90969d9b42c409f26f410 SHA-256: 2ae1b8365c76563bbf35c6fbdb16b734e7753168460ee43d8b0458dee2bb10b7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable domains and compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://semangkabiji.com/contents/files/zesewubabajoritixedib.pdf In PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/sugigaxoniwixobenemuvi.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/18863816896.pdfIn PDF document text
    • http://popmetre.com/news/files/51005001430.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613979810d096---67899088132.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/xejuvaroluwapuv.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/pupito.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613566310a593---27300056648.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/rasojumatuzavixewolux.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/18734649634.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/5072690709.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410dfe3fdeb---topos.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/73512191475.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rojavudutiwokuviburisafi.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/83426724173.pdfIn PDF document text
    • http://koala-al.com/d/files/nunepidaxapusesefilinop.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/boguritaw.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/kuvalamenafedezi.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/juvum.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/kuvosa.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/37967783021.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=android+remote+jobsPDF 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_off0000cdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C1 10452 bytes
SHA-256: 445777b846befa3d355b61d9e2744e3e6557e4716864d9bea3bb27a41034d0e8
font_02_sfnt_off0000fd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD66 17724 bytes
SHA-256: 5ada380eaeef812a49999143e9aecb1aa9ef60c0d3cd2b4458bb95e35d4a124c