Malicious PDF — malware analysis report

Static analysis result for SHA-256 38bfbcf92a8b9141…

MALICIOUS

PDF

80.9 KB Created: 2021-08-20 12:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 400e9d2916fb8ee95c290f6521404d71 SHA-1: e2db4896902ebab077d8efe4a95c62d984eded87 SHA-256: 38bfbcf92a8b91415a9669eaa662c33e81aced3d934d82eef0ea62591f8e8703
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms. This suggests an attempt to lure users to potentially malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1611781be4f958---87335441275.pdf In PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/76cc631abe184d30e6fe1b77bac89f8e/bawavuxanoz.pdfIn PDF document text
    • http://cphs1970.net/clients/877309/File/jatubenikujonem.pdfIn PDF document text
    • http://jaika.in/images/documents/files/zepazafilefotako.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ef8091e32---vugazupokolupurobezilax.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b283f0d28---kusejapubepokujok.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/73269819389.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/220711542025.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772360a789b---zalakofuxopovemovemaxutad.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/sekuvozejex.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/xezilujudosusixizuf.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/57583314288.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/8539629060.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/64287848770.pdfIn PDF document text
    • http://tcmoving4cure.com/clients/a/a2/a295acc0500fd37d831de80ba00a7552/File/fujupevoreveraf.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/835f1a9f5c19d17fec095e9b3e8052ec/viwububeninibipibig.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-2/20210502202225587042.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/rokebevogokomexotoban.pdfIn PDF document text
    • https://empresa-venta.hr/files/61460443648.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16246528147141.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/panuxaveduzagugurirojejav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mlp+game+mod+apkPDF 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_off0000dacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACB 10260 bytes
SHA-256: f48aa89ccd93602082000393be5534ddf3180934f99464631c2780037a766807
font_01_sfnt_off0000f1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A2 16568 bytes
SHA-256: 77515e5a1358f2e303bec620d59119b03cb05ebbd94c43fed8c79c6410bf6c0c
font_02_sfnt_off00011cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1