Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6ee09a6600582b…

MALICIOUS

PDF

85.1 KB Created: 2021-09-05 22:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cec2b0c4bfde26ddddac042fe4061b4c SHA-1: 35f407d00f9603e1028b21b657fa83fc5984cd8d SHA-256: ff6ee09a6600582bb86de53d06247cdc0019feeba208f1202a78c7e5cb97a10c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. These factors, combined with ClamAV detection and ML flagging, strongly indicate a malicious intent, likely to lure users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://suchanekstomatolog.pl/files/file/weripelabawinuseniwapuf.pdf In PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b96643440ec---71253934906.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/63513310518.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/8f7ace0cd48136bdd552e46257137108/pawegidejusevi.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/kuwefekadumorot.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/xufavizugunodevag.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/38559099736.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/3361560432.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/fopitiwogotinubitifoba.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9f43d0617---214922302.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/xijur.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f45be3b3736---46391462687.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a27e1d3b1---60916316855.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/zejokixakolug.pdfIn PDF document text
    • http://whatdwellswithin.com/file/88381795121.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/aca612a8f93a0778407b6bf91be1b171/vagajamago.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/pasitopowijinuriw.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7347ca596f---jolunelovedorutujol.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/vagas.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/38557220108.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e21dfce2c85---99937117346.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/kaxatuboxog.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/meravugoxizuzikisuvi.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd43150afe4---53828149955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=bisaya+to+tagalog+dictionary+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
font_00_sfnt_off0000e698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAF 10828 bytes
SHA-256: 79c08193dd0ca8a7a25852bc88528091aaa28101643b0b4b030b81ca6dbd35ae
font_02_sfnt_off0001179d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179D 17992 bytes
SHA-256: 0f5938e706e87ecfe8ec4e278c27083ea7082f7d75023362c86b212657c94b39

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