Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dff4f3437d7af53…

MALICIOUS

PDF

97.2 KB Created: 2021-09-06 05:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8492c04e23bbdf0cb576d463b249d591 SHA-1: d9929db7cd9eeab1ce40ab86420459116105a3c6 SHA-256: 7dff4f3437d7af53ba370eb749f62f8df85143f9a5fe6397bd945d3e4b1bb823
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/v16qdvdp0luntsejrj4ffto5g0/zesirekixix.pdf In PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/61419255750.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pakefisuxug.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e124961da3---81665459776.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/rimuzafogovode.pdfIn PDF document text
    • http://renknh.com/ckupload/files/dulijupodavifixanoliluwo.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608204c219134---vuginulanumifanebexup.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16119e4f43f809---94220259669.pdfIn PDF document text
    • http://veejaytechnologies.com/userfiles/file/babuzaru.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/zefozekenazege.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d4cd27dd116031ef82097786cdbea950/37465307742.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/88303919825.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/0941a328df1ab3210986bdd657f32faa/gatiboduvofere.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/81481778905.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/zoniwigup.pdfIn PDF document text
    • http://eurekaloggers1970.com/clients/a/a4/a4917853023b9a70bc4506ca58f09c65/File/jivowarovibajejeviv.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/kinetibofojujuw.pdfIn PDF document text
    • http://abnicum.com/files/file/12337780379.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735715c778a---wubasovogifuxumagezawu.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/0c55b3d6b6be6647458c2a9c1dc4e386/2291353124.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/mcigdov9e1675pj9mie86qeqj2/rokirile.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/faxes.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/6133293107fdb.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/bejujogipanixijozugetane.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/42370854005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=camel+husbandry+manualPDF 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_off000113b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B2 10588 bytes
SHA-256: ee25ec5f2b43d2ee2741f890fd012ba43338b4dc861e2e9346bd899bf2217b55
font_01_sfnt_off00012ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA0 19576 bytes
SHA-256: 4f0f8613647fd9385bd3267bf3208d0700fa55c2ee1e696ea625bba14dfad5a0
font_02_sfnt_off00015f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1