Malicious PDF — malware analysis report

Static analysis result for SHA-256 818e18e7e3550475…

MALICIOUS

PDF

69.7 KB Created: 2021-09-17 03:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 327b45f3276ad3365bd2e2d75ce86e48 SHA-1: 3e130f33f5ded5021c8314793122e56818258224 SHA-256: 818e18e7e355047513cf2b4407620dd054853f8f14199824f1af7938548a312d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of these links suggests an attempt to lead users to phishing sites or download further malicious content.

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://www.azurwelcomeservices.com/userfiles/file/dediwipufijimigo.pdf In PDF document text
    • http://pieseclimaauto.com/files/file/55556427248.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/pevasozadisusate.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/55659822610.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/5792733011.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/79955906791.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/601372897ebf5e4034f8b424a0d9e466/pukama.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/muriniwozirak.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/95553155584.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/tofigi.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac80b9e10c---bidexitotojonetu.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/6jmii1qpl89eecshlsqnuh85b5/zezumiwekifas.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/30583224095.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140247b38bf7---xasifarumegigin.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/99403929278.pdfIn PDF document text
    • https://businesslife.com/content/files/wipovuzopipot.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/35511638311.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16143b675a88fc---73781221893.pdfIn PDF document text
    • https://5uempat.com/contents/files/devanupopadujakeworet.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/tuwironibixinumiruxapu.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109030019556433.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/10794734840.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/rapifabuloliborodedabiral.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/98e04bad9e5caf1e40185f9582d4546d/tafomixi.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210901051518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=samsung+galaxy+a71+firmwarePDF 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_off0000b275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA87 14828 bytes
SHA-256: 72a015e5c6f0c5460928e58a02f7c2d20ec74c31253e3c1483b838268566303f
font_02_sfnt_off0000efef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEF 10916 bytes
SHA-256: 7a265b9dc8377d004ae22471cf5da13db366c5eea45b86402847eeccebbc571b

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