Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef0f3d1a2bbd3fa…

MALICIOUS

PDF

78.2 KB Created: 2021-09-13 16:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2efdc5ed6aa646feef89896ad44ac352 SHA-1: 9128035f8fd491eaca547f40efc097f9e279e044 SHA-256: 1ef0f3d1a2bbd3fabdcbcd9c4abc6ed5c090eaf13475cc347deb4371f11419bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple external URLs, many of which are hosted on disposable domains or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://zap-interactive.com/uploads/files/xaniluderefajuzanelivu.pdf In PDF document text
    • https://areicon.com/images/file/26646898268.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/31637996538.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/88817172738.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/59656822711.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/6920501365.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebc6f1bc2a---28817934276.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/b5e5a2f5c1566376399598b92b04cc47/49866779890.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613252b39dffa---faxurofumizupenetevunaxo.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/46493755380.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161379ffc12539---lezimiseloziminaxitozupup.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/sugixusoxekanibozowizew.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/736989494.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/vixamuwadetana.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ba81cf554---nepudukarusowefat.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/eb3f7229339f906c950d3248dbfc75a1/37073647310.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/81d0a965511fd6b50abe1865aceb4a3b/64957449618.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091104460938.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/17231270127.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/dugozuwigenudeno.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/a83b58482283d02e2acb877b63806fc6/52780036042.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/11364215003.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/neseselajin.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210908221401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=mujhse+dosti+karoge+full+movie+watch+online+123moviesPDF 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_off0000ca6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6D 11736 bytes
SHA-256: 686f9f240ef021d761b1bf3f91e33fab7269922eead304c15a1078c44454e23d
font_01_sfnt_off0000e639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE639 17424 bytes
SHA-256: 3091b6ce7da505d867855398c5fb0552d5ce370513a6ddcd7449825c2d46e6e7
font_02_sfnt_off00011339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11339 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1