Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ffd38f3448c972b…

MALICIOUS

PDF

76.2 KB Created: 2021-09-03 11:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2d7ab04d7ffae1501e075fc71c17ecd0 SHA-1: 219ac8048b7a19e62753e8da1e6d21f72306f0ec SHA-256: 9ffd38f3448c972bb3b9b082bfda1c0d5e33cc2db1036e4ab970c1359ba307bb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised CMS upload directories or disposable hosting. The presence of numerous external URIs suggests a redirection mechanism, likely to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://angkaganjil.com/contents//files/tajaniwojewewekibopak.pdf In PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/kakqu8oi2f7dnchhqtelo59963/365272110.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/48229477583.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/filukozebimemowurariwuz.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21d091fff0---lotobe.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/11263536927.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/78995021818.pdfIn PDF document text
    • http://sivam.pl/files/file/sizidik.pdfIn PDF document text
    • http://a-xian-coat.com/uploads//files/202108031144288721.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/pvhh8hdh2egjrvtslmjl2todh2/digozurovavuvenididumu.pdfIn PDF document text
    • http://yuhongzg.com/d/files/jemesibaxomusofodo.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e26f9dc1a0dad92fa9630dfeea784ae5/watomilisavanotiwug.pdfIn PDF document text
    • http://ruresept.ru/files/file/ximubosaxinam.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/27167137551.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/sizojizurifavijifisitifof.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/43131820840.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fac7d264d91---65837705899.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/89418304754.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3f49ad241c856de5418416b6d6fbd910/jikipulule.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607116c4db27e---kivirugobafak.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/24284029357.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b47c68782c---gesufuzimegovabu.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/tixuzawarowimemar.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///37203416997.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/3325682111.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/vasabepajixeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=in+vitro+dissolution+and+drug+release+testing+pdfPDF 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
stream_004_off0000e090.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE090 10792 bytes
SHA-256: 2b3960d7e1658d892a36d718d4295ac56d01ed3fc9a1fc0b44b41a7111760b79
font_00_sfnt_off0000c879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 16128 bytes
SHA-256: 6c59aedf74b9832d686b31bd935153f7737571ba3d42b3442cec7d5f174ef0fc

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