Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df7bc038b08f754…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 00:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5198f558aaae675f491072157537a056 SHA-1: f795efcc47cd9757dfb3ee6f3810526d59f8b6ea SHA-256: 5df7bc038b08f75434a9bc8c0a649bf27836c4f1692112bb369f0bc45ad43fb9
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The presence of multiple links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609c36d53342b---nutajakituwujesap.pdf In PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/69136674022.pdfIn PDF document text
    • http://industrialdevices.in/uploads/86282997754.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6d8f31b5e71172037e7ff942c3e861ec/dovodadinepiteg.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/55659429986.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b8dd1c522a---kagulizateredigunokatuxe.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099640615eec---pixenogawugatiwuwutifu.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/89672733531.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f1476e646---45218389873.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/79067579216.pdfIn PDF document text
    • http://glbtrader.com/userfiles/file/40902266761.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5eafe840f---nedadudewarawalike.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/tapuzema.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/8b8ad72ef078c34160e9070e61e15eda/wunoriwizavigejitodasux.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/joluxigiwige.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/nixomezolakinud.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/kudirovogo.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/jizizomojirejokogukat.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/21de2ff1cdf417cfda087c39a979a3e4/13743122467.pdfIn PDF document text
    • http://splogservice.ru/content/file/damoxedili.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/33d800535d0ec8ade6ff6b4be9664100/ludoraxarosegomirigu.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a360e4c9c42---21644067167.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/sfcsdkq9a5fqlfkpe7a85q5jk2/zagadutineta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=yaesu+ft-60+owners+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_off0000db33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB33 10776 bytes
SHA-256: 09dc4c448488f88c1ae3420f27abec7bd0683edfb0f834486e7782973f0f6d0b
font_01_sfnt_off0000f429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3B 17968 bytes
SHA-256: b4abc5abaefba6f5be16688668a4f32a870469a6f1a0a1744db76df567bf15e2