Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1b27fc581e7c3a…

MALICIOUS

PDF

73.7 KB Created: 2021-09-17 06:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 89cc596821e688cfc84753b2f1ec53d9 SHA-1: e37a3c46f5181c53844a965509ad1a953e0e1ae1 SHA-256: 6f1b27fc581e7c3a9b2f379a6aaef13d97e7563a7e4e34f62d863aa9c570dc92
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised websites, indicating an attempt to redirect users to malicious content. Heuristics indicate it's a link farm on disposable hosting and a phishing lure, with ClamAV detecting it as a phishing trojan. The ML classifier also strongly flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d93a0bceb---21253300215.pdf In PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/34939875244.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/fabirunimelote.pdfIn PDF document text
    • http://haai.org/upload/file/80595898986.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-12/20210912085441865475.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/14255122191.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143d0063bf3d---zaxivavuladasatepi.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/64501565536.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3b4cc2e01cba3c31fa7d13aeb51fd397/lawes.pdfIn PDF document text
    • http://lawngo.net/fckfiles/puxakazalimofez.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/1156965481.pdfIn PDF document text
    • http://chenruichem.com/upload/files/91567242074.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/4610086920.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/bonerexizovigeda.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/dubogulimezunejitejus.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/65093112264.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e92799113---90469096733.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/50327703362.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/sotifidix.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79808140968.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/gebidupupave.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/kirisebalekojadiberab.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/lamub.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a6b0a79c708f7630d001360d3d996177/zesakaxememogiworesul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=word+formation+exercises+with+answers+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_off0000be1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD631 15928 bytes
SHA-256: 90936d41a520e0f140daa648344ce20f216a666db850510e6a47d1f5cdb9f8e0
font_02_sfnt_off0000ff27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF27 11020 bytes
SHA-256: 9489d2516a3d52f3838ad0dc823ce251d1005e9e7c97386881a3bcf2f97f576b